Question about 1988 Chevrolet C/K 3500

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1989 454 3500 3sp-auto

I'm looking for a way to get better mileage out of this truck? changing to a higher ratio rear-end? what rear end ratios were used? or should I change out the 454 for a 350?

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Two words..... :- GAS CONVERSION ! 37p per litre.

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  • Chevrolet Master
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Dont wish to appear rude but if you want economy a nice VW caddy,or peugeot partner.if you want larger then a ford transit ,its the best white van around ,3.5 litre petrol here in spain we would have recylcled that monstrosity years ago,Doubt if it would evan pass the emission laws here now.

Posted on Feb 02, 2009

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I have a 2004 Chevy s10 4 door pickup 4 wheel drive rear axle code gu6 and g80 what rear ends interchange with this


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Wanting to know if the rear end on a GMC pickup (92) can affect the performance of the engine


The short answer is yes. Rear ends are made in a variety of gear rarios depending on what you want to do with the truck. If you want to haul heavy stuff around most of the time then you are loking for a gear ratio in the area of 4.10 to 1. If you occasionally put a load in it and do a lot of empty driving you would want a ratio about 3.00 to 1 or lower. They will all affect mileage.

To find out what your truck has there should be a tag on it but it's probably rusted off by now so jack up the rear end and remove the cover. Have a drain pan to catch oil. Use something like White Out to mark a tooth and count the teeth on the big (crown) gear and do the same with the small(pinion) gear that drives it from the driveshaft. Divide the small number into the big one and that is your gear ratio. If you are looking for better mileage go to a smaller ration. The closer you get to 1:1 the better mileage you will get but you will lose grunt on take off. If you want help moving a loaded truck go away from 1:1. Hope this helps.

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I have a 85 dodge truck with 318 727 tranny short wheel base my rearend is noisy i want to change it . i pull a tow dolly with it the ratio is 3.26 gears i would like to get better gas milage will a...


Hello and Welcome to FixYa.com



the higher the number the higher the rpms 3:55 will burn more fuel. The 3:21 gets better gas mileage.



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What is the rear wheel bearing gear ratio for a 2001 Chevy Blazer 4WD - 2 door?


I think you mean the rear end ratio. there is no gear ratio for the wheel bearing. If you look at the factory sticker on the drivers door, there will be an "axle code". write that down and then look here for the ratio.

http://www.drivetrain.com/parts_catalog/ring_and_pinions/what_gear_ratio_do_i_have_in_my_gm_or_chevrolet.html

Jan 05, 2011 | 2001 Chevrolet Blazer

1 Answer

I have a 1990 ford F150 XL. 5.0L and changed the rear end to a 308 from a 355 to help with gas mileage. The motor is new. No real significant change in mileage. Any suggestions


Did you replace the speedometer gear so it reads correct. mileage may not be affected as much as you would think. The ECM is calibtaed for the rear axle ratio.

Nov 17, 2010 | 1990 Ford F150

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Want to change gears in rear end for posi traction in a 98 gmc25000 is this possible?


It is possible, you just have to know what gear ratio you have in your Sierra. I had issues with my son's rear differential and did the Salvage Yard and picked one up for $250.00 with less then 45,000 miles. Remember new cars end up at Salvage Yards also.

Here are the Pro code for the rear ends to your Sierra and you can match one up at a Salvage Yard.
GQ1 -- AXLE REAR, STD RATIO
GT4 -- AXLE REAR, 3.73 RATIO
GT5 -- AXLE REAR, 4.10 RATIO
GU4 -- AXLE REAR, 3.08 RATIO
GU5 -- AXLE REAR, 3.23 RATIO
GU6 -- AXLE REAR, 3.42 RATIO
G80 -- AXLE REAR, LIMITED SLIP (POSI TRACTION)

HC4 -- AXLE REAR, 4.56 RATIO

Open Your glove box and look inside it. Should be a list of codes on the bottom.
Example: GU6 G80 According to that, you'll have a 3.42 posi

Good luck and keep me posted and call around Salvage Yards, there prices will differ from one to the next salvage yard and don't ask them for a posi rear end. The cost will you more, just search all the SUV's and look at the pro codes in the glove box. Hunt, most awd system SUV will have the G80 rear end.

Good luck and keep me posted.

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1 Answer

How do I replace the ring gear and pinion in my 68 Camaro 12 bolt


You can change the ratio back to 4.10. However, if you do not already have the specialty tools required to do the job, you will likely be better off finding a shop that will change the gears for you. A mistake as simple as incorrect backlash will result in destroyed ring & pinion gears.

Your cheaper options will be :
1. Find a matching rear-end with 4.10 gears and swap it in.
2. Purchase the ring and pinion, master install kit, and find a friend that has installed gears before to help you out.
3. Find a 4x4, Hotrod or auto shop that is will swap the gears for you. If the axle is in the car, it's usually more expensive than if you carried the axle in for them to work on.
4. Purchase R&P, Master install kit, all the required tools. Then hit the books to find the proper procedure and measurements for that axle.

Good Luck.

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Rear end gear ratio


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Bad milage


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