Duramax Diesels Forum Truck of the Week
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Old 03-27-2017, 07:31 PM
unfinished business unfinished business is offline
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Default 1971 Chevelle Duramax Swap and Build

After 14yrs of trying to buy my first car back, I finally got the call I have been waiting for. The car literally sat in a damp garage for 14 years, but believe it or not, I primed the oil pump, put a battery in it and poured some gas in the carb and it fired up! I actually drove it home...thank god it was on 15 min away lol.

The car is an almost original (carb and intake swap only) 71 Chevelle that my dad and I bought many years ago and rebuilt. It is nothing crazy, just a 307, PG Trans, and an 8.2 with 3.08 gears .

So, I got to thinking about what I was going to do with it. BBC? LS Swap? Procharged SBC?

Well, I am very happy I sent a text to Russ at RPM Motorsports. We went over TONS of different options and I finally decided a Duramax with a Th400 would be the ticket for me. Unfortunately, he is ALL the way across the country from me, but the shippers literally just picked my car up, and Russ should have it sometime next week!

This will be a street car and weekend racer. I plan to drive this car as a nice weather DD, get 20 plus MPG and run pretty quick at the track.

Either way, more details to follow. I will keep this thread up to date, and I am sure Russ will add some details as he goes as well. This should be a wild ride!

I will post some "before" pics in a bit.

Paul
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Old 03-27-2017, 08:01 PM
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Old 03-27-2017, 08:02 PM
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Subadubdub
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Old 03-27-2017, 08:30 PM
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Pics attempt 1
Attached Images
File Type: jpg 20170304_162558_resized_1.jpg (182.9 KB, 165 views)
File Type: jpg 20170316_155625_resized_1.jpg (90.2 KB, 146 views)
File Type: jpg 20170316_155630_resized_1.jpg (99.5 KB, 129 views)
File Type: jpg 20170316_155656_resized_1.jpg (90.9 KB, 146 views)
File Type: jpg 20170316_155705_resized_1.jpg (87.9 KB, 127 views)
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Old 03-27-2017, 08:34 PM
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Nice! Congrats. Should be awesome
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Old 03-27-2017, 09:32 PM
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Old 03-27-2017, 09:39 PM
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Subd!!!
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Old 03-27-2017, 10:09 PM
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I would seriously consider a 4l85e if you plan on driving it alot. Overdrive and lockup should help out alot with highway running, and lockup really helps with a diesel imo.
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Old 03-28-2017, 03:35 AM
unfinished business unfinished business is offline
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Quote:
Originally Posted by THEFERMANATOR View Post
I would seriously consider a 4l85e if you plan on driving it alot. Overdrive and lockup should help out alot with highway running, and lockup really helps with a diesel imo.
Excellent point sir. Russ is actually going to try test fitting a 4l80e and we will see where things go from there. We are both hoping it will fit with little to no modifications to the floor/tunnel.
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Old 03-28-2017, 09:34 AM
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I'm actually with THEFERMANATOR. Was the first thing I thought of but being a new guy didn't wanna make an idiot of myself. No overdrive is gonna seriously limit you in top end speeds.
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Old 03-28-2017, 09:35 AM
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Quote:
Originally Posted by THEFERMANATOR View Post
I would seriously consider a 4l85e if you plan on driving it alot. Overdrive and lockup should help out alot with highway running, and lockup really helps with a diesel imo.
Picked up a core 4L80 this last weekend. Will mock it up once we get the factory equipment removed, and see how much sheet metal would need come out. The 400/GV setup has worked flawless for years, Rick still daily drives his Chevelle, but would really like the 80 in there if we don't have to cut too much out. Looks like the Chevelle will be here at some point today.
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Last edited by RPM Motorsports; 03-28-2017 at 09:42 AM.
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Old 03-28-2017, 07:34 PM
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Theres not a huge diffetence in size between a th400 vs a 4l80e. The gear vendor is another option, but I would go 4l80e any day of the week for a lockup converter. If you go 4l80e, I would look for a 4l85e out of a van since it already comes with the best of oem pieces, wider band, and solid shafts. Cuts down on some of the pieces needing upgraded to hold up to big power.
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Old 03-28-2017, 08:11 PM
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4l80 will fit in a G-body tunnel, pretty sure it will fit in the Chevelle just fine.
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Old 03-28-2017, 08:59 PM
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Quote:
Originally Posted by THEFERMANATOR View Post
Theres not a huge diffetence in size between a th400 vs a 4l80e. The gear vendor is another option, but I would go 4l80e any day of the week for a lockup converter. If you go 4l80e, I would look for a 4l85e out of a van since it already comes with the best of oem pieces, wider band, and solid shafts. Cuts down on some of the pieces needing upgraded to hold up to big power.
Th400 lockup converters are available.
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Old 03-28-2017, 09:42 PM
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Quote:
Originally Posted by A. Stock Lbz View Post
Th400 lockup converters are available.
I have an M&M lockup 400 available if needed, really banking on the 4L though. Car finally showed up after some delivery drama, should be ready to dig in by Friday.
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