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Unread 10-04-2011, 07:58 PM   #1
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1984 CJ7 
Join Date: Jun 2011
Location: deep river, CT
Posts: 194

I'm thinking about regearing I have an 86 cj with a t176 4 speed and an I6 with a weber and header... I want to run 33"s I thing or maybe 35"s what would be the best ratio and still be able to keep good speed on the high way?

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Unread 10-04-2011, 08:28 PM   #2
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1981 CJ7 
Join Date: Mar 2011
Location: Canton, Connecticut
Posts: 125
what are you running now? 4.10 are kinda best of both worlds in my opinion, thats what i am aiming to get for my jeep i have 3.73 now.
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Unread 10-05-2011, 01:38 AM   #3
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1981 CJ7 
Join Date: Jul 2009
Location: Bali, Indonesia
Posts: 4,401
Try the ratios on this table for 55mph running speeds. A CJ is brick shaped so 55mph is as much as you can hope for without burning a lot of petrol.

4.10 will stretch to a 33" tyre but may be marginal on economy and acceleration for a 35" as you are driving a lot of metal forwards at only 2,200 rpm. You would then find you had to drop to 3rd gear to accelerate and live with a limited and uneconomical top speed as the engine struggles to accelerate and maintain speed.

4.56 is a better range of ratio.
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Unread 10-05-2011, 02:02 AM   #4
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1980 CJ5 
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If you happen to have one of the 86 CJ-7's that came out with a Dana 44 rearend, you could go to 4.27 which would be a nice compromise ratio with 35's. If you have the AMC 20, then your choices are narrowed to 4.10's or 4.56. If you decide on 33's 4.10 is a good ratio. Incidentally, your transmission is likely a T-177 with 3.82 first gear. A metal tag fastened to the passenger's side of the case will have one of these numbers stamped on it.

5359389 = T-177 (3.82 first gear)
5359390 = T-176 (3.52 first gear)
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Unread 10-05-2011, 06:43 AM   #5
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1984 CJ7 
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Posts: 194
The tranny and axles are an 84 the engine is 86
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