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Second gen chevy to cummins power, how-to post

That picture I posted is my NVG5600 with a 205 bolted to it.


It is an early '90s dodge 205 that come off the getrag IIRC. it is a 29 spline male on both sides with a coupler. and round 6 bolt mount pattern. That is as far as I know the only 205 that will bolt up to the 5600 to give a proper passenger side drop neccissary for our GM's.

205-2.JPG

205-6.JPG

5600-205-2.JPG


this is a little side by side of a 4500 top and 5600 bottom
NV45005600.jpg
 
1967k10 said:
Will a spacer from a Cummins/th400 work on an early GM nv4500?
Click to expand...
It may let you put a Chevy bellhousing on... but I don't know if it will work with the clutch.
 
stoneagemaxx said:
how about a dodge 203 to the nv5600?, you can use the dodge 203, and the gm 205 w/ ord's doubler
Click to expand...
Does a Dodge NP203 have the round 6 hole pattern? I'm not sure about that... think it was a figure 8 pattern on the 727/NP203 I rebuilt a few years ago. But you can redrill and tap the face of the NP203 for the round bolt pattern.
 
Some updates


MOTOR MOUNT THOUGHTS


I have procured a 12v motor which Im building

Im running another thread about building the cummins... but I wont put that here because it clogs the post
Since I started this thread a number of gen 1/2/3 cummins conversion postings have been going up around the forums... TDR now has several excellent threads
(SEE TIMO's http://www.turbodieselregister.com/forums/showthread.php?t=66674
and P Kirby's http://www.turbodieselregister.com/forums/showthread.php?t=136977for gen 2)... and a number of pictures (P Kirby has taken excellent pictures of his motor mounts)

I have 1989 gen 1 dodge mounts already on my motor and Im going try to adapt those to my chevy mounts using P Kirbys (TDR) ideas,, it keeps things really stock looking and uses stock parts... and the chevy's frame was designed to take loads in the existing crossmember area

There are several more companies out there doing conversions and making mounts... they make for some good ideas for fabbing your own
If you are even consdering the conversion your fabbing skills should be excellent...if they arent try a welding class..Lincoln is even offering a nascar fab school now...
Im putting the links to two companies that are making motor mounts...Im not suggesting you purchase them but again they are some examples of stuff out there....
http://www.autoworldmt.com/Page_9.html
http://www.screaminseeman.com/home.php


Radiators

I recommend looking at P Kirbys M1008 cummins post at TDR... hes used a duramax radiator and the intercooler and it looks like it is a doable conversion..I have a question into him about it so there will be an update here

Tranny Transfercase

The more I look at it (since Im going auto) I think the only way is to go all dodge... so Ill be in the market for a 205 gen 1 auto case... and Ill figure out which auto od will work best for the conversion

Right now Im dealing with gathering parts, trying to get some more auto tranny/transfer case answers, and rebuilding the CTD,, Im still getting sticker shock over cummins parts prices... but thats why they run so well for so long

cam
 
contact crewcab59 on here... hes making engine brakects and crossmembers for the conversion...

support a brother ck5er

cam
 
more cummins updates

I have a followup question....

I have a 727 tranny that came with my cummins... mated to it.. it has the aluminum engine to tranny adapter... but its from a 2 wd truck....

1) I want to use a later dodge EOD tranny.. maybe a 47h... will the original 2wd 727 adapter work ?

2) Does anyone know for certain which gen 1 205 I need to get to fit the auto... (they made two spline versions)... are the main shafts swappable if I find the "wrong" spline version?

3) Im in the market for the factory adapter... dodge auto to dodge 205... anyone have a line on one before I post elsewhere

Im electing to use a 3 inch lift... and perhaps 1 inch bodylift... to give me every last inch

Lastly..I have an a/c truck... it looked to me as if it will clear the turbo... but be tight.. am I correct?

thanks "turbomen"

cam
 
camsk5 said:
I have a followup question....

I have a 727 tranny that came with my cummins... mated to it.. it has the aluminum engine to tranny adapter... but its from a 2 wd truck....

1) I want to use a later dodge EOD tranny.. maybe a 47h... will the original 2wd 727 adapter work ?

2) Does anyone know for certain which gen 1 205 I need to get to fit the auto... (they made two spline versions)... are the main shafts swappable if I find the "wrong" spline version?

3) Im in the market for the factory adapter... dodge auto to dodge 205... anyone have a line on one before I post elsewhere

Im electing to use a 3 inch lift... and perhaps 1 inch bodylift... to give me every last inch

Lastly..I have an a/c truck... it looked to me as if it will clear the turbo... but be tight.. am I correct?

thanks "turbomen"

cam
Click to expand...

I'll say what I know:
The 205 case is the same as well as the adapter, the input shafts are interchangeable.
 
I've found out there are 2 different versions of output shafts... the earlier one like your 727 and my 727 are 23 spline... later versions went to 29 spline thought due to problems of the cummins breaking output shafts from what I have heard. I have no idea of when it changed though. The V10 uses the same bellhousing pattern of the cummins too, so if you find a tranny from a V10 it should fit the cummins.
 
thanks kenny,,,,,

I was at the local diesel shop today looking at one of their conversions on a v3500 crew... it was nicely done and pretty sano
They certainly tried to talk me out of my gen 1 12v saying the later 215 hp motors (post 95) were the only way to go and were so much more peppy and responded to modifications to easily see 300 plus hp... Ill have to think this one out for awhile... I only want 220hp and mileage.... of course I was talking to guys who build 600hp plus 5.9s... so its kinda like asking a drag racer for a stock 350....

they swear by using GEN 2 mounts,, and while the gen 1 are easier to adapt the gen 2 hold the motor much better and cut down on vibration... they attest to this by gen 1 mount conversion trucks cracking the frames while using gen 2 mounts dont.... I think Ill have to go with them on this one... Ive seen how they use and abuse (puller/drag trucks) their trucks

The conversion I saw the fabber basically cut the whole chevy center core support out of the radiator area and then braced it... this opened the entire area up for a chrysuckler radiator and intercooler and gave lots of room to work with... I was pretty impressed with what I saw ... it was sano (Ill try to get some pics)
He used a dodge 205 which was spaced with a piece of tube directly on the chevy crossmember,,, he aso used a bodylift and had zero firewall issues and had chevy ac/dodge compressor with the frame notched and beefed for the compressor... He had a 4 inch exhaust down the passenger side... it was tight...real tight over the transfer case and he said if he was to do it again he would go a slightly higher bodylift which would obviously give some more room for exhaust... ( look at 2.5 inch bodylift)
He used stock chevy springs with an extra leaf... he said a 3 inch kit would be perfect,,, his ends up being 2.... the truck rides better than new ones...

It looks like Im going to end up with a 23 spline 205 and then find the right auto stuff to match... its all in the input shaft... someone out there is making a 23 to 29 spline shaft but like ords they are specialty items and spendy... I think its better to stick with off the shelf stuff should one break down in bumfarkegypt...

more to follow

cam
 
Gentlemen ,
This is a great thread - so glad I found it in my info search !

Question - Is the Cummins 4BT/6BT to GM bolt pattern adapter number 3910516 equal to a GM part number 15634354 ?
I have a few friends digging up info for me at a GM dealership and I want to make sure we are asking our Cummins connection for the correct part.
Any info you guys can provide is greatly appreciated !

Thanks ! Tom
 
tom... Im not sure if thats the crossover number,,, but I think Jamie Advant will know... his number is in the first post here


cam
 
If I remember right the 4bt and 6bt mounts are identical to those for a 1979 dodge with the 360. So if you can't find the 4b and 6b mounts ask for some out of a 79 dodge one ton with the 360.
 
Talked to Link Belt .. a member here, this morning and he has given me some great info for the thread ... thanks Link

Excellent cummins dimensional layout specifications in PDF format ..It was too large a file to include but if anyone wants it please IM me with your email address and Ill send it to you

some neat pictures of a motor stand.. whats interesting is the layout of the accessories.. all up top out of the way of frame rails.. excellent for conversions.. Ill ask him more about this.. but if you setup your engine this way it would eliminate many of the frame shaving issues..


EDIT/UPDATE
Apparently those accessory brackets are made by AUTOWORLD... he hangs out over at TDR.. Ill get a quote for ck5 people and post... give me a little time for some research




cam

cumminsparts 002 ~1.jpg

cumminsparts 004 ~1.jpg

cummins crossmember example.jpg
 
Last edited by a moderator:
more pics

more pics

hey.. how did that driveshaft get over there???
a template... Linc says it needs a little work but that its within a quarter inch

the crossmemeber in this pic appears to me to be offset to the pass side ,,looks like for driveshaft /dif clearance...I have seen trurcks that didnt have to do this,, anyone do theirs WITHOUT offestting?

cummins crossmember 2.jpg

cummins template 1.jpg
 
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Engine stand

Cam,
Can you get more photo's from the side (both).What is that set up, is that the Kenworth .

That the same set up of a stand that I have but my arms bolt up to my mounts that I make.Also it will run on the stand as well ,I have Battery,and fuel tank on there to..

Thanks
CrewCab59
 
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