my 85 chevy c20 diesel trans question/tips/ideas??
 

sup guys! well i went and got me a new project, its a 85 chevy lwb c20, 3/4 ton.

its got the diesel engine thats not running, bad heads. but i plan on pulling that out and dropping in the 454out of my old 87 chevy rust bucket crew cab dually..

heres the question...
will the transmission off this diesel fit and work with my gas engine?? im askn cuz the 400 trans on my 454 is on its last legs....

i havent pulled either engine out, but wanna know ahead of time what to expect before i hit it this weeknd..

thanks....

or how is it that some of yall have converted these diesels onto gasoline....:metal:

Re: my 85 chevy c20 diesel trans question/tips/ideas??
 

What tranny is behind the 6.2? 700R4 or TH400?

Re: my 85 chevy c20 diesel trans question/tips/ideas??
 

x2 if the 700r4 is in their that might last for a while depends on condition if you got a turbo 400 then it will be better.

Re: my 85 chevy c20 diesel trans question/tips/ideas??
 

Did this same swap with my '84 suburban several years ago, the only thing that you might run into is if the 454 flexplate has holes to line up with the converter bolts, I had to drill mine to line up, other then that it was/is a striaght swap. As for the 700R4 trans I had it rebuilt at the same time, so it was "fresh" but I used this to pull my 26' racecar trailer everywhere & have never had a moments problem with it!

Re: my 85 chevy c20 diesel trans question/tips/ideas??
 

thirdstreettito ---yeah its the 6.2L diesel engine, and the transmission looks like the th400.

Matt Man---- so even even though its on a diesel engine, it will work the same if i put it on the gasoline engine? input shaft will be the same and all??

heres a quick picture i snapped of it earier today after lunch.

Re: my 85 chevy c20 diesel trans question/tips/ideas??
 

looks like i have the th400, will i have to do drill the flexplate also? could i use the diesel flexplate on the 454?

Re: my 85 chevy c20 diesel trans question/tips/ideas??
 

Keep the original 454 flexplate, holes "should" be ok.

Re: my 85 chevy c20 diesel trans question/tips/ideas??
 

thanks guys...

Re: my 85 chevy c20 diesel trans question/tips/ideas??
 

the governor and the torque converter are going to be different...you need to keep both of them from the trans behind the 454...