78 chevy 4x4 3/4 ton engine swap
 

Hi, I have a 78 chevy 4x4 3/4 ton pickup and I am putting a 2002 chevy 5.3 engine and 4l60E transmission in it. I was wondering what you guys think would be the best transfercase for my application. thanks a lot!

Re: 78 chevy 4x4 3/4 ton engine swap
 

I had a 203 transfercase in the pickup but with the new (4l60e) transmission I need a diff. transfercase please help thanks!

Re: 78 chevy 4x4 3/4 ton engine swap
 

do you want to keep a full time case or does it have a part time kit in it? You may need to find an adapter that will let you bolt it up to the 4l60, maybe advance adapters. I aint a hundred percent but I think they have the same tail bolts and pattern as a 700r4? if so then it's the same as a th350 and all you need is a th350 or 700r4 t-case adapter which came stock in these trucks so should be easy to find. I'm not completely sure of the tail though so might need to research more, if not then advance adapters should have what you need. I thinkmost 4x4 that had the 4l60 is a DS drop like the 88-98 trucks so it would be on the wrong side for your front axle. That may not be a problem if you wanted one of the newer like 241c t-cases but you'd need a new front axle like a ford one or something with a ds pumpkin/diff. That could lead into alot of things, like steering, brakes, etc, that would need modified or changed.

If the th350 or 700r4 adapter would work on your trans you could use a 208 t-case or even hunt down a 205, maybe find the 88-91 burb 241 that has a ps drop.

Re: 78 chevy 4x4 3/4 ton engine swap
 

Hey thanks a lot I'll check it out

Re: 78 chevy 4x4 3/4 ton engine swap
 

Benoit454 thanks alot, advance adapters had the adapters i needed to put my old t-case on my 4l60e, thanks so much

Re: 78 chevy 4x4 3/4 ton engine swap
 

Does anyone know how to tell a 203 t-case (is a 203 full time?) from a 205 t-case i think my 78 chevy pickup has a 205 but not for sure, it had a 400sbc 400trans. It has a spot for a PTO to be mounted, i know they put tags on transforcases but i can't find one. Thanks

Re: 78 chevy 4x4 3/4 ton engine swap
 

Does your truck have unlockable front hubs?

Re: 78 chevy 4x4 3/4 ton engine swap
 

The 205 has a small circular plate in back with 3 bolts on it. It is gear driven (not chain) and is the strongest T case in these trucks. Bulletproof.
Posted via Mobile Device

Re: 78 chevy 4x4 3/4 ton engine swap
 

the hubs are warn hubs and can be locked and unlocked, and i looked at the circular plate on the back and it has more than 3 bolts so i guess its a 203?

Re: 78 chevy 4x4 3/4 ton engine swap
 

Does anyone know where one can find custom motor mounts for 78 chevy to a chevy 5.3? thank you "the white elephant" your help was great!

Re: 78 chevy 4x4 3/4 ton engine swap
 

thanks a lot to all the guys who have been helping me on here, last week i got my 5.3 sit in my pickup and this week hopefuly i can get a the motor mounts put in. This is a project, but a fun one so worth it hope to have pictures up soon.

Re: 78 chevy 4x4 3/4 ton engine swap
 

hey just woundering, if I would put long tube headers on my 5.3 does anyone know if that will help my mileage? just not to sure thanks!

Re: 78 chevy 4x4 3/4 ton engine swap
 

As far as I know, not a noticeable amount.

Re: 78 chevy 4x4 3/4 ton engine swap
 

thanks TheWhiteElephant your help is great i got one more ? for you. Do you know where i can find fuel pressure spec's. here the deal i have a 2002 5.3 enigne and i need a fuel pump for it and i think it needs 55-62psi and i found a 07 chevy pickup tank and pump do you think the pressure would be the same or not? thanks guys!