What gears in the rear-end?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

steves1967 · 04-22-2004, 01:38 AM

I've got a 90 1/2T burb, 4WD, 350, 700r4 tranny. Anybody know what gears are in the front and rear end? All i know is that with the 35's on it now the thing is a dog!!!

*bisquik65* · 04-25-2004, 07:27 PM

Get the three letter code of the glovebox label that starts with the letter g . (ex . gu6 6t4 ,ect ) gu6 is 3.42 and gt4 is 4.10 . let me know what
it is and i can tell you. Also a g80 means posi.
My 80 here is 4.10 and 35s and it pulls good.

Grim Reaper · 04-26-2004, 11:02 AM

Cart before the horse.

Gears before tires ALWAYS. I would stop driving it till you get the gears done. 700r4 will not put up with that long.

35's with a 700 I would go with 4.56.

*bisquik65* · 04-26-2004, 09:39 PM

My 80 is a turbo 400. It does make a differecne over a 700r4.

steves1967 · 04-27-2004, 12:54 AM

Well I looked up the number's in the glove box, it says GT4 G80, so I guess i have a 4.10 posi. Sure doesn't seem like it though, guess I'll have to pull the diff cover and verify it. Also- what rear-end/ front end is it? Is it a corporate 10-bolt???

Thanks for all the help.

Steve

*bisquik65* · 04-27-2004, 09:06 PM

I am sorry steve but gt4 is 3.73. gt5 is 4.10.

steves1967 · 04-27-2004, 09:08 PM

no problem- i'll probably go to a 4.10 gear- that might help a bit! But it's still a pig...LOL

IoWnZa · 04-30-2004, 09:13 PM

I have a 12 Bolt with 3.08's and 32's...

Good thing the Big Block can make up for it till I get 3.42's. I don't know why I didn't put a diff. set in when I had the new 3.08's put in during the building of the new Rear End...

smokkey1 · 05-03-2004, 04:19 PM

Quote:

Originally Posted by bisquik65

I am sorry steve but gt4 is 3.73. gt5 is 4.10.

are you postive gt5 is 4.10???

ALASKA ALUMINUM BEAR · 05-04-2004, 03:42 AM

as i just finished both my front and rear axle now for the 3rd time--i am sure you have 373--in the axles with out anydoubt....if you are not on the highway's much--then listen to the advise given on the 456-gears....but if your like me and highway cruse thousands of miles-then go with the 410-411....this will give you tons of power--and you'll sh-t over the differance...from the 373's

but if in the future you plan on going to 38's at all- then go with the 456 now and save you time and bucks latter.....i really wish i had gone with the 456-instead of the 411---but the gas consumption is to much--if you do not need the 456 every day,,,,i run 36'' trxus---and still have enough power to eat these new big fords for breakfeast....

hope this helps

aabear
john

**kwmech** · 05-15-2004, 01:14 AM

I have 4.56s in my 90 3/4 ton with 285/75r-16 tires and am always pulling it out of 4th to get the rpms and the power up, but cruising down the freeway on the flats it likes 75mph with 16mpg.

04-22-2004, 01:38 AM	#1
steves1967 Registered User Join Date: Dec 2001 Location: Manteca, Ca USA Posts: 305	What gears in the rear-end?? I've got a 90 1/2T burb, 4WD, 350, 700r4 tranny. Anybody know what gears are in the front and rear end? All i know is that with the 35's on it now the thing is a dog!!! __________________ '71 Chevy 3/4 Ton Longbed '22 Chevy Tahoe RST '67 Firebird- 8 sec street car '24 GMC CC 4x4 Duramax Dually

04-25-2004, 07:27 PM	#2
bisquik65 Account Suspended Join Date: Apr 2004 Location: N.C. high country Posts: 6,107	ratios Get the three letter code of the glovebox label that starts with the letter g . (ex . gu6 6t4 ,ect ) gu6 is 3.42 and gt4 is 4.10 . let me know what it is and i can tell you. Also a g80 means posi. My 80 here is 4.10 and 35s and it pulls good.

04-26-2004, 11:02 AM	#3
Grim Reaper Registered User Join Date: Jul 2001 Location: Atlanta GA Posts: 1,704	Cart before the horse. Gears before tires ALWAYS. I would stop driving it till you get the gears done. 700r4 will not put up with that long. 35's with a 700 I would go with 4.56. __________________ Grim-Reaper 70 Pontiac LeMans Sport Convertible, worlds longest resto in progress Looking for 71-72 2wd Blazer or Jimmy Project

04-27-2004, 12:54 AM	#5
steves1967 Registered User Join Date: Dec 2001 Location: Manteca, Ca USA Posts: 305	Well I looked up the number's in the glove box, it says GT4 G80, so I guess i have a 4.10 posi. Sure doesn't seem like it though, guess I'll have to pull the diff cover and verify it. Also- what rear-end/ front end is it? Is it a corporate 10-bolt??? Thanks for all the help. Steve __________________ '71 Chevy 3/4 Ton Longbed '22 Chevy Tahoe RST '67 Firebird- 8 sec street car '24 GMC CC 4x4 Duramax Dually

04-27-2004, 09:06 PM	#6
bisquik65 Account Suspended Join Date: Apr 2004 Location: N.C. high country Posts: 6,107	ratio I am sorry steve but gt4 is 3.73. gt5 is 4.10.

04-26-2004, 09:39 PM	#4
bisquik65 Account Suspended Join Date: Apr 2004 Location: N.C. high country Posts: 6,107	My 80 is a turbo 400. It does make a differecne over a 700r4.

04-27-2004, 09:08 PM	#7
steves1967 Registered User Join Date: Dec 2001 Location: Manteca, Ca USA Posts: 305	no problem- i'll probably go to a 4.10 gear- that might help a bit! But it's still a pig...LOL __________________ '71 Chevy 3/4 Ton Longbed '22 Chevy Tahoe RST '67 Firebird- 8 sec street car '24 GMC CC 4x4 Duramax Dually

04-30-2004, 09:13 PM	#8
IoWnZa Big Block Blazer Join Date: Sep 2003 Location: Ellsworth, ME. Posts: 509	I have a 12 Bolt with 3.08's and 32's... Good thing the Big Block can make up for it till I get 3.42's. I don't know why I didn't put a diff. set in when I had the new 3.08's put in during the building of the new Rear End... __________________ [1985 Chevrolet K5 Blazer][454BBC][TH400][NP241][Dana 44][GM 12 Bolt w/ Eaton LSD][Hedman HTC Hedders][Dual 2.5" Stainless Steel Exhaust][Hedman Turbo Muffler's][Dual Spal's 14" Electric Fan's][32x11.50R15 BF Goodrich All Terrain TA KO's on 15x8 Rallys]

05-04-2004, 03:42 AM	#10
ALASKA ALUMINUM BEAR Registered User Join Date: Mar 2004 Posts: 129	as i just finished both my front and rear axle now for the 3rd time--i am sure you have 373--in the axles with out anydoubt....if you are not on the highway's much--then listen to the advise given on the 456-gears....but if your like me and highway cruse thousands of miles-then go with the 410-411....this will give you tons of power--and you'll sh-t over the differance...from the 373's but if in the future you plan on going to 38's at all- then go with the 456 now and save you time and bucks latter.....i really wish i had gone with the 456-instead of the 411---but the gas consumption is to much--if you do not need the 456 every day,,,,i run 36'' trxus---and still have enough power to eat these new big fords for breakfeast.... hope this helps aabear john

05-15-2004, 01:14 AM	#11
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,634	I have 4.56s in my 90 3/4 ton with 285/75r-16 tires and am always pulling it out of 4th to get the rpms and the power up, but cruising down the freeway on the flats it likes 75mph with 16mpg.



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