Sounds crazy huh?

Is it possible? Anybody attempted this? sources for adapters?

I think it is if you used one from a big truck (c40-80) and used a SAE bellhousing behind the ctd. The big truck 4 speed has a monster input 1.5" (I think) compared to the pickup truck 1.125", it is much longer than the little chevy shaft as well, and has a bigger pilot size as well. The clutches used in these setups are massive and ceramic button versions are commonly available. The flywheels that were used were approximatly 50-60 lbs on gasser versions. Parts from the old big trucks can be had for next to nothing oftentimes.

hmmm, something to think about i spose.

Reason i'm interested/curious, is the 727 in my CTD (in another post: trans options) is roached and i need a good replacement. I'm totally new to dodge transmissions.....but i have 3 spare GM 465 trannys sitting in the shop, awaiting use.

Figured if they would work, maybe i should just "use what i have" so to speak

I know that there is an adapter for a cummins to a chevy bellhousing, they put 4BTs in frito lay vans. they came with a chevy turbo 400, Im not sure of any good source for that adapter but I heard they were expensive, good luck

there's 2 adapters on ebay, but i dunno if they would work for a SM465.......

Keep us informed of what you find; as, I have a 1978 K-20 Chevrolet, with the SM465 and NP205, in line for a 1st Gen. Cummins transplant.

Those old Chevy 4-speeds are pretty much bullet-proof.

I also have an entire 1964 50-series GMC, with the older version 4-speed (the one with 7.something to one first gear), and a big-block V-6 GMC truck engine.

I may borrow some strategic pieces from the larger truck.

I would love to restore the old 64 GMC, but it appears that rust may have gotten the upper hand on this one.:(

I would have to cut a few trees out of the frame, as well.[laugh]

I have a friend who works the counter at Cummins Rocky Mountain, he priced all the components needed for this exact swap at around $1300. This includes engine adapter, bellhousing adapter, flywheel and the starter, he said some of these parts can be had used off of core engines for a sustantial savings. I have the Cummins print out in my shop, I can post part numbers if you want them.

X

I have the Cummins print out in my shop, I can post part numbers if you want them.

X

That would be AWESOME, YES i'd like the part numbers

Theres a guy on 1stgen.org with a 4bt backed by a 465. He was asking about compounds on a 4bt, you might find him for questions you may have.

thanx, will give it a shot

Here are the part numbers I have for this conversion. Looks to me that you would be ahead of the game to find a Getrag/NP205 combo, the transfer case has the front axle output shaft on the correct side for a Chevy and you gain an over drive gear. The SM465 does have a 6.7 to 1 granny gear and is a stout tranny, however the NP205 that goes behind the SM465 has smaller input/output shafts than the one that goes behind the Getrag.

I am putting a Cummins in an 85 Blazer and considered using the GM tranny transfercase untill I saw how much the parts were. Best of luck,

X

3910516 Transmission Adapter 289.96

3906803 Flywheel Reman/Used 400.00

3913056 Flywheel New 870.34

3934080 Spacer, Starter Motor 72.43

3906804 Cover, Flywheel Housing 276.11
Reman/Used

3916101 Cover, Flywheel Housing 648.34
New
Cover Flywheel Housing=Bell housing I think.

3964432NW Starter, Denso, 12V, 268.84
13T, 2.5KW

The money you save on the swap will probably be lost in fuel economy especially if you do some freeway driving. Just a thought. Jethrro

thanx for the parts numbers!

You may also be interested in looking around at http://4btswaps.com for other transmission options. The 4BT & 6BT share the same engine adapter & bell housing configuration. The weakest point would be 11 inch clutch used in the 4BT.

Alot of the 4BT bread vans had the SM465 so that would be a good source for the adapter and parts needed. The starter is on the wrong side. It also clocks the trans at a wierd angle. I just sold mine on ebay for $600, there is usally a few on there.

thanx for the link to the 4bt swap forum, ALOT of useful info there!!

The 4BT & 6BT share the same engine adapter & bell housing configuration. The weakest point would be 11 inch clutch used in the 4BT.

Could not one bolt a 6BT flywheel on the 4BT engine and then use the 13" clutch??

not sure on the interchangability, but something i am checking into.
I was going to ask basically the same question about the clutch/flywheel, but i am still waiting to be "approved" to post over there :(

Check this out:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=018&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=280127427949&rd=1&rd=1