Rear Ratio for 66 with 5 speed

JamesFee · November 23, 2007 at 1:11 PM

I installed a T5Z 5 speed ahead of a 3.89 rear. Originally, I had 4.11's (with a T-10 4 spd) but long cruises were winding the motor out pretty tight if I had to get on an Interstate or Highway. The 3.89's helped quite a bit - but now with the 5 speed I seem to be at a similar predicament but on the other end: First gear winds out really quickly.

I was thinking of going down to a 3.50 or maybe even 3.25 and was curious if any of you had any experience with this.

Thanks

j

63Kcode_old · November 23, 2007 at 5:45 PM

I have 3.50s in my 66 Shelby with a 5 spd and realy like them. Peppy in the lower 4 gears and quit in OD.

Larry

JamesFee · November 24, 2007 at 12:30 PM

Thanks Larry -

I appreciate the answer.

jim

Rohan_old · November 24, 2007 at 6:18 PM

James,

My 66 Shelby has a T5 with the 2.95 first gear. I believe that you can also get a 3.35 first. It has 3.89 rear end. The combination is fine, although I would prefer a longer first gear. At 60 mph in 5th the car cars on 2200-2300 rpm so it still has some nice punch in 5th.

Rohan

CB01 · December 20, 2007 at 2:01 PM

I ran a 3:50 9-inch in my '67 w/ a World Class T5 (modified 302 V8). Not bad at all, but in 5th gear I wished for something a bit shorter - so maybe 3.73 or 3.89.

BiffF15 · December 21, 2007 at 6:39 PM

CB,

What size tires/wheels are you using and what RPM's are you pulling at 65-70 MPH?

Thanks,

Damon

Rear Ratio for 66 with 5 speed

Participate now!

Users Viewing This Thread