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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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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74 VETTE WITH 350 zz4 ENGINE 62mph THE rpm's at 3,000 and screaming (red lie starts at 5,000) what is my gear ratio and what should it be for highway driving

Assuming the tires are close to standard (i.e., 275/60/R15), this means you probably have a 4.11 ratio rear end in your Corvette. This was a very popular ratio on Chevys for drag racing. For highway driving you would want a higher speed ratio, such as a 3.55 or 3.36 ratio (or even a 3.08), depending on what is available. which would give you 70 MPH, 75 MPH, or 80 MPH at 3000 rpm.
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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

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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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.

Jan 05, 2011 | 2001 Chevrolet Blazer

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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

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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.


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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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 :
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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

you can count the teeth on the ring gear and divide that # by the tooth count on the pinion. An example is: ring gear 100, pinion 10 ...100divided by 10 is 10, expressed as 10 to one. (fake #) your diff is likely a 3 series such as 3.23 to 1. or a four series such as 4.11 to 1. If you have four wheel drive it is critical to match exactly. if not you can get better performance by changing ratio to something that better fits your needs. 4 series pull loads well, 3 series are better on fuel.(depending upon terrain)

Jun 28, 2009 | 2000 Chevrolet Silverado 1500

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Can i use transmisson from other type in my c2500 1983 chevy

your cheapest bet is to go with a different gear ratio in the rear diff(the lower the ratio the higher speed and less rpm) but if your truck has a 3 speed automatic you can put a 4 speed with overdrive (700r4 would be the best)
is your truck 2wd or 4wd?
hope this helps!

Jan 11, 2009 | 1984 Chevrolet C2500

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Bad milage

that sounds about right to me, and if you run that fuel with ethanol in it that does not help either

Sep 26, 2008 | 1997 Ford F350 Crew Cab

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