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post #1 of (permalink) Old 06-07-2000, 09:30 PM Thread Starter
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someone told me that if you have a high geared vehichle you dont need and over drive....my jeep is my daily driver....has a the stock T5...wanting to go to a world class T4 or T5.....will have 33's and 4.10ish gears...(have the tires and gears, not installed right now)

do i need an overdrive if it sees highway time? or can i save the money and get a T4?


Jeep'n Greg
1985 CJ7, 258, t-5, d-300,
2000 TJ 4.0L, jamboree edition
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post #2 of (permalink) Old 06-08-2000, 09:20 AM
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Re: overdrive?

Terry Howe has a tire & gear applet that will answer your question. I guess it all depends on what your comfortable with in terms of highway rpm & mph! Anyhow... try this link:


post #3 of (permalink) Old 06-08-2000, 09:40 AM
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Re: overdrive?

BTW: A T-4 has a final ratio of 1:00, while the T-5 has a .86. With 33's and 4.10's at 70 mph you're looking at approx. 2900 rpm's for the T-4 versus 2500 for the T-5. (if my math is correct!) I remember hearing a WC T-5 had a final ratio of .83 sometime ago, but I don't know that for certain.

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