1965 k20 7.3?
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From: emporium
1965 k20 7.3?
i have a 1965 chevy k20 4x4 that can run 37's factory. it currently has a good old 350 in it with factory 573 gears. im thinking about dropping a 95 7.3 psd into it with a set of 8 straight cut stacks. what do you think? bad *** toy? i was originally gunna drop a 6.2 detroit in her but i wanna do something different. to many people doing the cummins swaps and with that big opening under the hood i think it should fit. looking at dropping the 5 speed tranny in it to.
yah or nah?
yah or nah?
Cargo Master
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From: Stillwater, OK
engine rotation is looked at from the front of the engine.
the GM 350 should be CCW
If the 7.3 is CW, you'll have to change the rear end, too.
Engine, transmisson, and driveshaft should all have the same rotation.
the GM 350 should be CCW
If the 7.3 is CW, you'll have to change the rear end, too.
Engine, transmisson, and driveshaft should all have the same rotation.
Cargo Master
Joined: Jun 2008
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From: Stillwater, OK
If the 7.3 rotates CW, the transmission would have to have a counter-rotating output shaft.
A quick google of the 7.3 shows a CW rotation, and I doubt the 5-speed you're using will have a counter-rotating output shaft.
The easy fix is to use the Ford rear end (hey, who wouldn't rather have a 3rd member anyway, right?)
If you don't, you'll end up with 5 reverse gears and 1 forward.
A quick google of the 7.3 shows a CW rotation, and I doubt the 5-speed you're using will have a counter-rotating output shaft.
The easy fix is to use the Ford rear end (hey, who wouldn't rather have a 3rd member anyway, right?)
If you don't, you'll end up with 5 reverse gears and 1 forward.
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From: emporium
well i like the 2 speed eaton axle thats in there now. plus it wouldnt look right. well im pretty sure my 97 f250 turns cw on the drive shaft but i will have to check. i might be able to change the gearing in the rear end if i need too.
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Cargo Master
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From: Stillwater, OK
Ha, I just found a site that mentioned both Std. and Rev. rotation for a GM 350
yes the GM 350 is CW, too.
Go for it!
If you can step up a size or two in U-Joints, do it. (try to get the yolk's caps to match the transmission caps).
Also, you may want to put some thought into the driveshaft itself. (1 piece, or 2?) If your angles are such that you can use a 1-piece, I'd suggest it, but it may not be possible.
Do you know which Eaton you have? They can you provide you with input Tq. and HP numbers. I doubt that 7.3 and a 5-speed would tear it apart.
You said K, right? What are your plans for a T-Case?
yes the GM 350 is CW, too.
Go for it!
If you can step up a size or two in U-Joints, do it. (try to get the yolk's caps to match the transmission caps).
Also, you may want to put some thought into the driveshaft itself. (1 piece, or 2?) If your angles are such that you can use a 1-piece, I'd suggest it, but it may not be possible.
Do you know which Eaton you have? They can you provide you with input Tq. and HP numbers. I doubt that 7.3 and a 5-speed would tear it apart.
You said K, right? What are your plans for a T-Case?
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From: emporium
it has a seprate transfer case in it that isnt bolted to the trany. so if the tranny doesnt stick out to far i can leave it wear it is and just make a short connection between the two. ill be set. no new drive shafts needed!
Cargo Master
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From: Stillwater, OK
no new drive shafts needed!
I'd still try to match the U-Joints that were given to the 7.3 if you can, on all 3 ends of the T-Case, and both diff yolks.
I'd also take the time to get Tq. and HP numbers for the diffs, but I guess if you can rest easy without them...
Remember you're going from a gasoline 350 from the '70s to a late 90's PSD. If you stick something in 4-Low the weakest point of your drivetrain WILL GIVE OUT! you want that weak point to be your engine stalling, and not a driveshaft aerating your bed, or axle shaft fission.
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From: emporium
i cant see anything breaking. this was made back in the 60's. everything is good old cast iron and steel. no aluminum like todays stuff. its probly more heavy duty than anything they make today. these trucks were made to do one thing take a load up ahill and back down. not for comfort or speed. back in those days they focused on the right things
Cargo Master
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From: Stillwater, OK
remember... i own one ;-)
broken just about everything on it, too
back then K-20 and K-30 had a few more differences, too. For example, rear ends were different (1/2's and 3/4's used Eatons, and 1's used Dana's)
broken just about everything on it, too
back then K-20 and K-30 had a few more differences, too. For example, rear ends were different (1/2's and 3/4's used Eatons, and 1's used Dana's)
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From: emporium
yeah. 1965 is a total diffrent world. they were just starting the 4x4s back then and there pretty rare. 75 wouldnt even be a eaton axel in it. the axels im talking about make a 14 bolt chevy 1 ton look like a toyota axel