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Diesel Conversions Convert gas to diesel, or convert to a 6.2/6.5/Duramax/Cummins/Navistar/Isuzu/Perkins/Detroit/or ... diesel engine. Go here to see completed projects, works in progress, share your conversion or ask the experts.

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Old 01-03-2009, 08:50 PM
andyvillen andyvillen is offline
Join Date: Dec 2008
Posts: 28
Default Any one put a Cummins 6bt into a 91 GMC?

Im wondering if any one has seen or heard of any one putting a 6bt into a 91 GMC with a 4L80E tranny.
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Old 01-11-2009, 09:02 AM
Robyn's Avatar
Robyn Robyn is offline
Missy Good Wench ( Moderator)
Join Date: Apr 2001
Location: Newberg Oregon
Posts: 9,617

Its been done.
A local fellow does a lot of 4BT swaps into the GM trucks.

The 4L80 does not seem to do well with these engines and the trick fix seems to be to use the 47RH mopar tranny with its own Tcase

I have seen this on mid 90's Burbs and it works well.


(1) 95 Suburban 2500 4x4
(1) 2017 Mercedes C class
(1) 1997 Astro "CATVAN II"
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Old 01-21-2009, 04:32 PM
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Burning Oil Burning Oil is offline
Join Date: Jul 2006
Location: Houston TX
Posts: 270
Default Here is mine

Its a 96,

1993 4x4 1ton 6.5/4l80e runs on WVO.
1996 1ton 2wd crew cab 6.5/4l80e with db2 IP.
1996 1ton 4x4 crew cab dually with Cummins diesel
1970 Chevy 4x4 big block 4 speed.
1972 Chevelle convertible with 540 CID engine.

We sell pmd extension cables and the Flight systems PMD or the new Stanadyne PMD with available 7 year warranty.
Turbo Boost Bolts, engine oil cooler kits and lots of 6.5 turbo diesel parts. Check out the web site
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