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Re: My Possible Project (1990 Suburban)
It's easy to tell, at least to get really close. Jack up the rear and put it on jackstands, with the trans in neutral. Make a mark on the driveshaft and one on the bottom of one of the tires. Spin the tire one complete turn, so the mark is back where it started. Count the number of times the driveshaft turns. If it turns slightly less than 3 and a half, then it's a 3.42. If it turns 3 and a quarter, then it's 3.73, so on and so forth.
You can also check the RPO codes if you can find the sticker. It will have the axle ratio listed.
-cal30sniper
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86 Chevrolet K20/30 Suburban - 8.1/NV4500/NP205/Dana 60/14 bolt FF, build in progress
73 Formula - 400/Doug Nash 4+1, resto on hold
86 Chevrolet K30 3+3 - 350/TH400/NP241, Air Force/Forest Service Rescue Truck, for sale
01 Ram 2500 - 5.9L Magnum, daily driver
91 BMW 325i - Chumpcar series racecar
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