Swapping a 1970 3/4 ton rear end - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Lil Chevy Rider · 06-19-2006, 10:14 PM

Right now I have a 1970 Chevy CST 3/4 ton pickup that had a 350 engine and I swapped it to a 1977 350 Monte Carlo engine and auto tranny. Right now I have a heavy duty 8-lug rear end and want to change it to a higher gear 5-lug rear end the easiest possible way that doesn't involve a lot of messing around like if theres one you can just bolt right in. If anybody knows what kind of rear end would go best or what it takes to do a rear end job, any advice or comments would be appreciated.

krue · 06-19-2006, 10:24 PM

I don't know the answer to your question, but you came to the right place for it.

Welcome to the board from South Mississippi!

Rod · 06-19-2006, 11:33 PM

Could be possible to find a dana 60 3/4 ton diff from this era..they had 3.54 ,4.10 or 4.56. gears possible for these year trucks. If you have the pumpkin with a salad bowl looking cover.....4.10 or 4.57...aftermarket 3.90 if you can find them.

Now if you go 12 bolt half ton diff..well, lots of options for ratios there.

wibilly · 06-20-2006, 12:15 AM

look at the 71 and 72 1/2 ton 2wd i think they were 5 lug, somone please corect me if i'm wrong

Lil Chevy Rider · 06-20-2006, 12:26 AM

Thanks for the advice about swapping the rear end.

69gmctowrig · 06-20-2006, 06:15 AM

If the spring perches are the same distance apart you can swap in an axle out of anything you want. easy as pie. even if they aren't the same it can be done, just ask how a ford axle fits in a jeep

06-19-2006, 10:14 PM	#1
Lil Chevy Rider Registered User Join Date: Jun 2006 Location: Washington Posts: 5	Swapping a 1970 3/4 ton rear end Right now I have a 1970 Chevy CST 3/4 ton pickup that had a 350 engine and I swapped it to a 1977 350 Monte Carlo engine and auto tranny. Right now I have a heavy duty 8-lug rear end and want to change it to a higher gear 5-lug rear end the easiest possible way that doesn't involve a lot of messing around like if theres one you can just bolt right in. If anybody knows what kind of rear end would go best or what it takes to do a rear end job, any advice or comments would be appreciated.

06-19-2006, 10:24 PM	#2
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	Re: Swapping a 1970 3/4 ton rear end I don't know the answer to your question, but you came to the right place for it. Welcome to the board from South Mississippi! __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

06-19-2006, 11:33 PM	#3
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Re: Swapping a 1970 3/4 ton rear end Could be possible to find a dana 60 3/4 ton diff from this era..they had 3.54 ,4.10 or 4.56. gears possible for these year trucks. If you have the pumpkin with a salad bowl looking cover.....4.10 or 4.57...aftermarket 3.90 if you can find them. Now if you go 12 bolt half ton diff..well, lots of options for ratios there. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

06-20-2006, 12:15 AM	#4
wibilly Senior Member Join Date: Nov 2005 Location: northwestern wi Posts: 2,111	Re: Swapping a 1970 3/4 ton rear end look at the 71 and 72 1/2 ton 2wd i think they were 5 lug, somone please corect me if i'm wrong __________________ common sense isn't so common anymore

06-20-2006, 12:26 AM	#5
Lil Chevy Rider Registered User Join Date: Jun 2006 Location: Washington Posts: 5	Re: Swapping a 1970 3/4 ton rear end Thanks for the advice about swapping the rear end.

06-20-2006, 06:15 AM	#6
69gmctowrig Registered User Join Date: Jun 2006 Location: greenville, north carolina Posts: 42	Re: Swapping a 1970 3/4 ton rear end If the spring perches are the same distance apart you can swap in an axle out of anything you want. easy as pie. even if they aren't the same it can be done, just ask how a ford axle fits in a jeep



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