Differential Gears... I need some! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

75stepside · 02-21-2004, 09:51 PM

Hello fellahs...

i'm putting a posi rear in my truck and i need some gears... i have a set of 4.88's that came in the posi unit, but i want to go with a 4.11 or 3.73 ... any opinions out there?? also, does anyone have a set of gears to sell?

(want to buy a good set of 4.88's?)

phantom dually · 02-22-2004, 01:10 AM

What rear are we talking about here??

75stepside · 02-22-2004, 11:28 AM

its a GM 10 bolt rear... 8.5", i believe or 8.2"... haven't removed the ring and pinion quite yet.

phantom dually · 02-22-2004, 12:28 PM

Should be atleast a 8.5" 10 bolt. The 8.2" was mostly used in passenger cars.

bigblock73 · 02-22-2004, 01:01 PM

If you are going to be running your th350 trans, then I would go with the 3.73 over 4.10 any day.

I had 4.10's and a th350...long highway trips were limited to 55-60 MPH...the rpm's were above 3000...and that was with a TALL tire!

Now if you decide to go with an overdrive or gear vendors unit..then 4.10/4.11 is the way to go.

One more thing, didn't your 75 come with a 12 bolt? 10 bolts weren't offered in the trucks until 80 or 81 I thought.

02-21-2004, 09:51 PM	#1
75stepside Proud Member Join Date: Nov 2002 Location: Pittsburgh, PA Posts: 741	Differential Gears... I need some! Hello fellahs... i'm putting a posi rear in my truck and i need some gears... i have a set of 4.88's that came in the posi unit, but i want to go with a 4.11 or 3.73 ... any opinions out there?? also, does anyone have a set of gears to sell? (want to buy a good set of 4.88's?)

02-22-2004, 01:10 AM	#2
phantom dually Project92 SWB stepside Join Date: Feb 2003 Location: Louisville KY Posts: 4,793	What rear are we talking about here?? __________________ 92 C1500 stepside 496 Stroker Competiton Engineering Ladder bars/QA1 coilovers. Dana 60 rear with 4.10 gear and posi. Bonspeed Palisade 20x12 in rear w/335/30/20 and 20x8.5 front w/245/40/20. 5/8 drop with Belltech springs/DJM spindles/drop shocks. WWS Progress thread http://67-72chevytrucks.com/vboard/s...d.php?t=140448

02-22-2004, 12:28 PM	#4
phantom dually Project92 SWB stepside Join Date: Feb 2003 Location: Louisville KY Posts: 4,793	Should be atleast a 8.5" 10 bolt. The 8.2" was mostly used in passenger cars. __________________ 92 C1500 stepside 496 Stroker Competiton Engineering Ladder bars/QA1 coilovers. Dana 60 rear with 4.10 gear and posi. Bonspeed Palisade 20x12 in rear w/335/30/20 and 20x8.5 front w/245/40/20. 5/8 drop with Belltech springs/DJM spindles/drop shocks. WWS Progress thread http://67-72chevytrucks.com/vboard/s...d.php?t=140448

02-22-2004, 01:01 PM	#5
bigblock73 yeller Join Date: Oct 2001 Location: Twin Cities Posts: 13,826	If you are going to be running your th350 trans, then I would go with the 3.73 over 4.10 any day. I had 4.10's and a th350...long highway trips were limited to 55-60 MPH...the rpm's were above 3000...and that was with a TALL tire! Now if you decide to go with an overdrive or gear vendors unit..then 4.10/4.11 is the way to go. One more thing, didn't your 75 come with a 12 bolt? 10 bolts weren't offered in the trucks until 80 or 81 I thought. __________________ Jeff 73-87.com 73-87.com Facebook page 73-87 cab corner 6x9 speaker brackets for sale 67-72 cab corner speaker brackets for sale 47-54 cab corner speaker brackets for sale

02-22-2004, 11:28 AM	#3
75stepside Proud Member Join Date: Nov 2002 Location: Pittsburgh, PA Posts: 741	its a GM 10 bolt rear... 8.5", i believe or 8.2"... haven't removed the ring and pinion quite yet.



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