What is good rear end gear for a 1985 GMC 1/2 ton truck?it is 2wd. It has a 2.73 in it now.It is a ten bolt. I have a 305ci pushing 400+ horsepower. I was wonder what is the best all around towing,good highway and take off speed? I was think a 3.42 or 3.73.
2007-02-12 17:04:31 · 3 answers · asked by 85GMC305 1 in Cars & Transportation ➔ Car Makes ➔ GMC
If you have a 700r4 overdrive trans, then 3.73 gears should still be reasonable on the highway. If you have a non overdrive manual trans, or a TH350 or TH400 auto, then switching to a lower gear ratio (higher numerically) will result in dismal gas mileage cruising down the highway, because the engine will be turning much higher revs.
2007-02-12 17:40:12 · answer #1 · answered by gt_rvspec_04 1 · 0⤊ 0⤋
If you have 400+ HP.. I would recommend a 14 bolt 9.5 inch ring gear Chevy differential. I is also helpful to have a limited slip carrier because the clutches keep everything pre tensioned. 3.73 would be a good ratio if you are using fairly big tires..
2007-02-12 18:40:43 · answer #2 · answered by the_buccaru 5 · 0⤊ 0⤋
Your sixty 4 rearend is A 12 BOLT. tHE CAPRICE IS a 10 BOLT. The sixty 4 has solid gears, the Caprice' is solid. Plus the sixty 4 is a 6 bolt,precise and the Caprice is 5 bolt. What does this tell ya?
2016-11-27 19:35:51 · answer #3 · answered by Anonymous · 0⤊ 0⤋