1977 GMC Jimmy Tranny help

[tcongo]

I have a 1977 4x4 Jimmy it originally came with a turbo 400. Upon dropping the tranny I have discovered it had been replaced at one point with a turbo 350. I have a turbo 400 out of a 81 two wheel drive 3/4 ton van that was recently rebuilt. Will this tranny work since it's out of a two wheel drive and if it does work will I have to modify anything on the jimmy to get back to a turbo 400. Also have never been able to get truck in too four wheel low I don't what causes this yet but was wondering if the swap to a turbo 350 may have had something to do with it. One more question the truck has emblems on the fenders that say gmc jimmy desert. I have researched but never found a desert jimmy i have found a desert fox but don't believe this is one. Thanks for any info and advice

 

[USSkoval]

In short, no it won't work without swapping parts and tearing down the tranny for an output shaft swap.

Also, I'm fairly certain there were never any Blazers/Jimmys with th400, except the 80's models with 6.2 diesel. I personally would stick with a th350 for simplicity, and they are pretty strong too.

 

[tcongo]

Thanks for the info. The service parts info in the glovebox say it has a M40 TURBO HYDRAMATIC. I assumed this meant it was a turbo 400 as stated on some rpo lists