Rear differential -
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post #1 of 6 Old 04-02-2012, 06:03 PM Thread Starter
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Rear differential

Have a 1953 m38a1jeep willy. The previous owner was building it up for climbing. The engine is an early 80's buick 231. The max speed I can get without blowing the engine is 45 mph. What can I do to get the mph up to 50-55 without blowing out the engine? Thank you, please help

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post #2 of 6 Old 04-02-2012, 07:13 PM
Rockin jeep
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Gear it appropriately for the tire size you plan on running.
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post #3 of 6 Old 04-04-2012, 05:49 AM
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1971 CJ5 
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Two options.
Re gear: Early CJ's came with 4'88 or 5.38 gears. they are completely over geared for modern engines and driving conditions.
An overdrive: Find a Warn OD to bolt on the back of the t case. These can be installed without dropping the transfer.
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post #4 of 6 Old 04-04-2012, 06:40 PM Thread Starter
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Thanks for the insight, sadly my car knowledge is zero. What's an OD? How does it work and where can I find these. Like I said all I want is to be able to drive around 50-60 without blowing up my engine. If that OD works I wil get on it.
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post #5 of 6 Old 04-04-2012, 06:47 PM
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OD= Overdrive a overdrive unit will help you to drive on the road
at higher speeds. It's like a extra tranny.

Rubicon Rich ,05 TJ Rubicon:
86 CJ7 258,T18,Scout Dana300,twin sticks,Dana44's,4W Disc, locked,35's,YORK OBA,Warn 8274,fullcage.
51 M100 1/4 ton Jeep trailer
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post #6 of 6 Old 04-05-2012, 07:41 PM Thread Starter
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I am looking those up right now. Thank you!
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