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SM465 and NP241 for a noob

k5warwagon

k5warwagon

1/2 ton status
Joined
Feb 25, 2009
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Location
Middleburg, NC
I found a SM465 for $100 bucks with flywheel and bellhousing. Also found a NP241 in great shape for $275.
Is this a good deal and how would it worrk with 4.10 geared 14FF and 35's....just starting to build my truck and looking at options. No rock climbing here in NC.
Thanks
 
If the tranny is in good shape, it would be a good deal. Even if you're not rock climbing, you always need a low gear, and the 6.5:1(? not quite sure) is great to have, and the tranny is known to be bullet proof.

As for the T-case, meh. It's a t-case. The 246 I have in my Yukon (basically an electric shift 241) does really well, but it's in basically a mall crawler and occasionally see's hard use.

Light duty equipment like the stuff found in 1/2 tons and what not aren't exactly designed for hardcore use, mostly for helping on snowy roads, etc. Since you have a 14bff in back, you're prolly into a little more serious wheeling then just weekend fishing trips to the remote lakes. I'd look for a NP205 if you can find one. That 241 will stand up if you're nice to it.

My $0.02
 
thanks man....I have a 700r4 and i guess a 208 in there now but they both are puking fluid. It's been in the garage a month while i try to fix the rust in the floor so I was thinking of the swap....i already got a 73 camper special for the 14 bolt and the 454 but haven't swapped it in yet either.
 
You have a 90? Well you already have a 241. Fix the leak and get the 465. It might take some work to get the two to mate though. Maybe a 208 with the 465 would be best.
 
I have a sm465and np208 in my wood beater and it works good foe me.as for the np241 its pretty much the same as the np208,the only difference is the tail is different for speedo cable,the 241 as a electric proxy to read your speed.
 
the 241 isn't a bad tcase it's just the aluminum case that turns most people off. true the 205 is strong as hell but it does only have a 1.96 to 1 low whereas the 241 has a 2.73:1 low. I think you're gonna have to have the 465/208 adapter because (somebody correct me if I'm wrong) the your current one won't work and the 208 and 241 mount up the same
 
I swear. I thought working on old chevelles and camaros was hard. I have a lot to learn in regards to the different setups for 4x's....up until now i just got in my old 85 K10 and drove the snot out of.....sold it for K5 and now the fun begins....\
thanks guys...
...went by a used lot here in town..they have a 90 2500 suburban 4x with 4 speed.....maybe i should just sell the k5 and buy the burb
 
dominic said:
as for the np241 its pretty much the same as the np208,the only difference is the tail is different for speedo cable,the 241 as a electric proxy to read your speed.
Click to expand...

Wrong! Apples and oranges. They just look similar. 241 is stronger, has an internal oil pump, and has lower gearing. I don't think any parts interchange between the two...

Aside from all that, they are the same.
 
definately drop that combo in. The 465 with not fail no you. The 241 from what i hear is stronger than the 208. I wheel pretty hard with the 465/208 combo with locked 35"s and the only problem for me has been worn shift forks (stuck in 4x4) but i think thats just due to age of the unit.
 
Chevy305 said:
definately drop that combo in. The 465 with not fail no you. The 241 from what i hear is stronger than the 208. I wheel pretty hard with the 465/208 combo with locked 35"s and the only problem for me has been worn shift forks (stuck in 4x4) but i think thats just due to age of the unit.
Click to expand...

Not much to a 208. drop that thing and replace the forks (they have nylon pads on them that could have crumbled-but not sure if that would make it stick in "FUN MODE", or just by a kit and rebuild it.
 
noJeepshere said:
As for the T-case, meh. It's a t-case. The 246 I have in my Yukon (basically an electric shift 241) does really well, but it's in basically a mall crawler and occasionally see's hard use.
Click to expand...

What year is the Yukon? The only 246 I have ever seen had an output shaft that was half as thick as either of my 241s


noJeepshere said:
Light duty equipment like the stuff found in 1/2 tons and what not aren't exactly designed for hardcore use, mostly for helping on snowy roads, etc. Since you have a 14bff in back, you're prolly into a little more serious wheeling then just weekend fishing trips to the remote lakes. I'd look for a NP205 if you can find one. That 241 will stand up if you're nice to it.

My $0.02
Click to expand...

That 241 has bigger output shafts than most 205s... that 241 has waaayy lower gears than ANY stock 205... The planetary gearset in a 241 is rated for more torque input than a 205 (donn't know about the chain though)... 241s came in 3/4 and 1 ton trucks just like a 205... pretty sure some 1/2 ton trucks came with 205s... 241s came behind the cummins in fullsized dually dodges with 5 speed manuals... They are half the weight of a 205...
I don't like the slip yoke on the back of my 241s, but that can be fixed for less than the cost of upgrading the stock outputs of a 205... oh yeah my 241 from a 1/2 ton has a 32 spline output already... my 241 from a 3/4 ton has a 32 sline input, and a 32spline output in the rear (not sure about the front output but I have heard of people using the front flange on their 205 when upgrading the shafts, so I'll aume it is) )

I would take a 241 over a 205 99% of the time. The main advantage a 205 has over a 241 is the housing is stronger...
I'll put a skidplate under my 241.
 
k5warwagon said:
I found a SM465 for $100 bucks with flywheel and bellhousing. Also found a NP241 in great shape for $275.
Is this a good deal and how would it worrk with 4.10 geared 14FF and 35's....just starting to build my truck and looking at options. No rock climbing here in NC.
Thanks
Click to expand...

You need to count the splines on the tranny and transfercase. For everything to bolt together as is, you would need the tranny's output shaft, and the transfercase's female input gear, to both be 32 spline.
SM465 trannies that had the 32 spline shaft would have had a 208 or 241 on the back of it.

32 spline 208s and 241s came on the back of turbo 400s and SM465s that were equiped for them.
the 208 or 241 that is on the back of your 700r4 is 27 spline and will not work.
Most sm465s will have a short 10 spline output designed for a coupler that mates to a NP205.

You can buy and swap in:
the correct shaft into the tranny...
or the correct input gear into a 208/241
Parts do not swap between 208s and 241s, and a 208 would be wasted time and effort accept as a bandaid while you find/build the correct 241.

The tranny sounds like a decent deal, but the transfer is a little high priced. If all the parts are compatable, jump on them fast. If not, you will spend time and money making them work. If the tranny turns out to be a ten spline, then the fastest/ cheapest thing you could do would be to find a resonably priced 205 and slap it on. I just sold a 465/205 combo for $75.
They are out there for cheap, just gotta look.

My 465 in my blazer had the origional 208(32spline) when I got it. I started looking for a good deal on a 32spline 241 the day I bought the truck. They were available in the 3-5 hundred dollar range... took me 4 months to scrounge one up for 150 bucks.
I love the 465/241 combo but I wouldn't sink 1000 dollars into it. (I wouldn't sink 500 into a 465/205 combo either.)
 
thanks for all the input....
I will give the guy a call on the 465 and probably have my fluid puking 241 rebuilt with the correct input...
the current setup runs excellent...it has been parked for 3 weeks in my shop while I work on the floors and there is a end table size puddle under neath the truck...coming from both the trans and case....
Seals? Vent stopped up? too much fluid/pressure in the trans pushing fluid out?

So my 241 is aluminum and should have a skid. Change the input to 32 spline and find a matching 465 and make the switch.

On that '90 2500 Burb I found yesterday....that would already have this setup along with the 14boltSF with 4.10's right....what would the front diff have been? D44?
 
You might want to look more seriously into the burb. Between time and money (mainly time), along with the coolness factor of the burb, you might be coming out ahead.
 
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