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Second gen chevy to cummins power, how-to post

From what I have read the 12 valve seems the way to go as far as engine. I have no problem with computers and wireing of the 24 valve, I just do not see a plus to all the headache. I am still leaning towards the allison but can not find the info that I want about it. It seems the guys at tdr are using Gm controllers and reprograming them to work but no one will say what they are using to reprogram them. Do you have anymore info on the allison. Also, what is the best fitting intercooler setup to use in the truck as far as fit and function while keeping a/c.
Daniel
 
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On the allison there is a guy on TDR that works for Allison he can help you,I think his name is Braydon and he live in IN.

The intercooler for the V3500 use the dodge 94-98.5 the only mods the intercooler is cutting of some round bolt mounting that you won't need.
the tanks will touch the back part of the plastic head head light.
 
What are the thoughts on using a divorced 205 to make it easy to run either an allison or the nv4500. Would that make since plus give you the longer front shaft when it is lifted. I know I am going to go with a 12 Valve. I want an allison but might run a nv4500 while I am getting all the stuff together just to get the truck up and running.
Daniel
 
sorry to make y'all suffer through newbie questions but, I have been seriously considering the cummins swap for my '87 Jimmy. Truck has now:
blowed up 350, sm 465, np 208, 10 bolts, 3"lift
Plans:
Cummins swap? sm465 or nv4500, 205 Lomax or 203/205 doubler, D60/14 BFF
My newbie questions are:
Can the NV4500 handle a built Cummins reliably? All the stuff I have read puts it rated a 450 lbft hence my confusion.
Is there any possibility of retaining my sm 465 with a cummins swap? I absolutely love my stock tranny!
I am really glad that I found this thread, I had been considering selling the truck due to not being able to find any diesel swap info anywhere (found plenty of people asking about it but no answers until now).
Thank you in advance!:D
 
blowedupmotor87 said:
sorry to make y'all suffer through newbie questions but, I have been seriously considering the cummins swap for my '87 Jimmy. Truck has now:
blowed up 350, sm 465, np 208, 10 bolts, 3"lift
Plans:
Cummins swap? sm465 or nv4500, 205 Lomax or 203/205 doubler, D60/14 BFF
My newbie questions are:
Can the NV4500 handle a built Cummins reliably? All the stuff I have read puts it rated a 450 lbft hence my confusion.
Is there any possibility of retaining my sm 465 with a cummins swap? I absolutely love my stock tranny!
I am really glad that I found this thread, I had been considering selling the truck due to not being able to find any diesel swap info anywhere (found plenty of people asking about it but no answers until now).
Thank you in advance!:D
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What Cummins 4bt or 6bt?
The nv4500 can take a lot of power,more than 450ftlb,a stock dodge 12 valve clutch is rated at 400ftlb ,no worry about that.
The dodge Nv4500 has 5th gear nut problem,when towing.
Gm Nv4500 has a different nut ,so no problems there.
The use your stock sm465 you'll have to use the P-30 adapter which clocks the engine to the right 7* ,this adapter will bolt up to the 4bt and 6bt.

The only problem with using the sm465 is a clutch that will take the ftlb of you go wild with the Cummins.

Any other questions Just ask,I have been doing Cummins Conversions for about 6 years.
Thanks
CrewCab59
 
blowedupmotor87 said:
sorry to make y'all suffer through newbie questions but, I have been seriously considering the cummins swap for my '87 Jimmy. Truck has now:
blowed up 350, sm 465, np 208, 10 bolts, 3"lift
Plans:
Cummins swap? sm465 or nv4500, 205 Lomax or 203/205 doubler, D60/14 BFF
My newbie questions are:
Can the NV4500 handle a built Cummins reliably? All the stuff I have read puts it rated a 450 lbft hence my confusion.
Is there any possibility of retaining my sm 465 with a cummins swap? I absolutely love my stock tranny!
I am really glad that I found this thread, I had been considering selling the truck due to not being able to find any diesel swap info anywhere (found plenty of people asking about it but no answers until now).
Thank you in advance!:D
Click to expand...

Comming from a guy that drove a Jimmy with a 5.9 turbo diesel, a perkins not a 6bt cummins but almost identical in size and weight, don't.
It's too heavy and too powerfull for the frame and the short wheelbase.
Go with a 4bt, many have already and it's great and gets more than 30 MPG.
Do a search on here there is a write up about it.
 
CrewCab59
I think a 6BT though a 4BT could be a possibility. I appreciate the info, if I decide to go this route, I may be actually seriously considering the purchase of a tow rig and trailer (I know a set I can buy for cheap that are ugly but reliable), and making a trip up your way (should you have an opening available to do a conversion). I have family in Indiana and I drive right through Knoxville on the way up to see them. Do you have a way of sourcing a donor engine and trans or would I have to supply my own? Right now I am trying to get in touch with NCDMV to see if they will allow the swap (the guy in charge of my county is on vacation and returns next week). Thanx!:D
imiceman44
I appreciate the feedback on the engine choice. You bring up a good point about the extra weight and the overpowering of the frame/wheelbase. I agree the 4BT would be a more practical choice but the info I have seen suggests that it would be stressed to put out the kind of power I would like. I don't want anything too wild, maybe even stock 6BT output for a while but never anything crazy. Ultimately I think I would like HP 300-350 range torque 550-600 range or there abouts. From what I have read (could be misinformation), the most stock HP for a 4BT is a marine trim engine with 250 HP but, that it has reliability issues. I must admit though that I don't know too much about them so, I will do some more research. Basically, I would like to do a swap to an engine that still has potential left in it for more power. Thanx!:D
 
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blowedupmotor87 said:
CrewCab59
I think a 6BT though a 4BT could be a possibility. I appreciate the info, if I decide to go this route, I may be actually seriously considering the purchase of a tow rig and trailer (I know a set I can buy for cheap that are ugly but reliable), and making a trip up your way (should you have an opening available to do a conversion). I have family in Indiana and I drive right through Knoxville on the way up to see them. Do you have a way of sourcing a donor engine and trans or would I have to supply my own? Right now I am trying to get in touch with NCDMV to see if they will allow the swap (the guy in charge of my county is on vacation and returns next week). Thanx!:D
imiceman44
I appreciate the feedback on the engine choice. You bring up a good point about the extra weight and the overpowering of the frame/wheelbase. I agree the 4BT would be a more practical choice but the info I have seen suggests that it would be stressed to put out the kind of power I would like. I don't want anything too wild, maybe even stock 6BT output for a while but never anything crazy. Ultimately I think I would like HP 300-350 range torque 550-600 range or there abouts. From what I have read (could be misinformation), the most stock HP for a 4BT is a marine trim engine with 250 HP but, that it has reliability issues. I must admit though that I don't know too much about them so, I will do some more research. Basically, I would like to do a swap to an engine that still has potential left in it for more power. Thanx!:D
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I can fit ya in,I do have engines in stock 4bt, 6bt and trans set up's if not than I can can get them .I have most all parts instock to do conversion.
I can also come and pick up the truck as well if needed ( that would be extra).

Most on road 4bt were 105hp 265ftlb ,4bta 120-125 300ftlb also depends on injection pump.To keep them with good fuel and long life 250-260hp will power the Blazer just fine.
The 6bt in a blazer would need so mod work to the frame,axles depends on what your plans are.

Thanks
CrewCab59
 
CrewCab59,
4BT with 250-260 HP, what kind of torque? Do you have one with that kind of output to it in stock? New, rebuilt or as-is? Could you PM me an approx price for a 250 HP rebuilt or new 4BT (could you do a quote for a rebuilt or new 6BT too please-thanks!) with a NV4500 + NP205 put in my truck? I can put a D60/14BFF under the truck (that was my original plan, already have the 14BFF in the garage!) Oh yeah, no need for A/C, I am used to not having it! What kind of charge would I be looking at for you to pick it up from me (Charlotte, NC) Thank you very much for your time! :D
Oh yeah, forgot to ask but, about what height lift do I need to have for a 4BT swap (I think I saw mention of 4" minimum lift for 6BT earlier, does your engine crossmember allow for a lower lift minimum?) with a D60 and ORD crossover steering (that's what I have planned steering wise). Thanx! :D
 
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blowedupmotor87 said:
CrewCab59,
4BT with 250-260 HP, what kind of torque? Do you have one with that kind of output to it in stock? New, rebuilt or as-is? Could you PM me an approx price for a 250 HP rebuilt or new 4BT (could you do a quote for a rebuilt or new 6BT too please-thanks!) with a NV4500 + NP205 put in my truck? I can put a D60/14BFF under the truck (that was my original plan, already have the 14BFF in the garage!) Oh yeah, no need for A/C, I am used to not having it! What kind of charge would I be looking at for you to pick it up from me (Charlotte, NC) Thank you very much for your time! :D
Oh yeah, forgot to ask but, about what height lift do I need to have for a 4BT swap (I think I saw mention of 4" minimum lift for 6BT earlier, does your engine crossmember allow for a lower lift minimum?) with a D60 and ORD crossover steering (that's what I have planned steering wise). Thanx! :D
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Pm sent.

Thanks
CrewCab59
 
CC59, have you done any 2wd crewcab converts? run into any special sets of circumstances for a 2wd chassis? with regards to engine mounts and crossmember?
 
DEMON44 said:
CC59, have you done any 2wd crewcab converts? run into any special sets of circumstances for a 2wd chassis? with regards to engine mounts and crossmember?
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I was gonna ask the same question :D
I was just contemplating putting my perkins (same dimensions) into a 2wd and the crossmember might clear, I might need to raise the mount 1"
 
I friend of a friend put a rotary pump 5.9 in a square nose crewcab. Its solid mounted and clears the stock hood. Ill see if I can get pictures, but will be later in the week.
 
I recently got the drivetrain out of a '94 2wd Ram for super cheap, and I can get a nice shape '86 3+3 dually cheap too. both standard trucks. been thinking maybe I should make lowrider puller that smokes like a freight train :D
 
DEMON44 said:
CC59, have you done any 2wd crewcab converts? run into any special sets of circumstances for a 2wd chassis? with regards to engine mounts and crossmember?
Click to expand...

I have done one of them but it's been a long time ago,I lost all of my old pics when the p/c took a dump.

Here is what I remember,the mounts work fine,and I used a small shim to clear the crossmember.I did this because the Cust had the frame already coated and he didn't want to do anything to it.I think the shims were 1/4 -1/2 shim.
I wished I still had those pics.

Thanks
CrewCab59
 
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