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87 chevy passenger van12/19/2023 ![]() ![]() The rears being a 7.5" or a 7.625" does not matter. The rear axle of the Trailblazer and Envoy are either an 8.0" or 8.6" so they are not useable. These vehicles are offered in 3.42, 3.73 and 4.10 ratios from the factory. The diff itself is not useable as these go through the engine block. You can also grab front gears from a Trailblazer or Envoy as they use the same 7.25" high pinion diff. The front has always been a 7.25" reverse rotation and early versions interchange with newer diffs. That is easy.you can use any ring and pinion out of an S-10 axle. I wonder what other vehicles you can salvage 4.10's out of. ![]() These vans used 7.6" ring gears from 1989-2005, so they probably interchange. That means they are probably hard to find, but I'm going to keep an eye out at the junkyard anyway. Timelessbeing wrote:So I guess the only possibility for a set of front+rear factory 4.10's would be out of a 1990/91 AWD van. Just compare them to the list provided below to determine you gear ratio. NOTE! The first 3 letters of the code stamp are the ones that matter. However, I have found that on 1988 and older, the code is found on the front of the drivers side axle tube. You will notice the code is located on the front of the tube on the passengers side of the van. You will need to clean off the axle tube well to see the letters-numbers clearly. The parking brake cable runs right across the area you need to see. But the only certain way is to loo at the numbers stamped on the crown and pinion gears.ĪXLE TUBE CODES: The surefire way to find out which gear ratio your rear axle has is to look at the spot you see pointed out in the image above. ONE way to be almost SURE what your rear axle ratio is will be to look at the actual factory code stamped on the axle itself. If you are not the original owner of your van you don't know for sure if the axle has been replaced or not. The RPO CODE on the sticker only shows which rear axle was installed at the factory. Note: I would be shot for doing just this at "that other site". If you click on the tech info tab, you find rear axle info as well as some stuff about how to do a gen 1 to Gen 2 nose swap, dutch doors from barn doors etc. AstroZam, Justice, I'm sure y'all remember that place eh? Heres the link, and a copy of the goods from that link. Actually, I knew it was there for ten years now. ![]()
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