projectresto83

Obviously after swapping in the 3.73's my speedo is off. Looking at latemodel's chart they don't have a gear for a 93 with 3.73's. Theirs stop at 3.55's.

http://www.latemodelrestoration.com/...lication-Guide

Now they do sell a kit that has the speedo gear and trans' drive gear that would make it correct but what do you guys use for the speedo gear itself?

Bubba 95SN

If you do not want to take the time to intall proper drive and driven gear just borrow a GPS. Then figure at what rpm the speed really is. Now no money or work involved.

Shelty

wheel size also effects this reading, since you have 17s... try calling Late model and talk to one of their tech guys. someone once told me that you can talk to a ford tech... but they prolly dont even know anymore

projectresto83

As long as the tire height is the same as stock the wheel size itself won't affect it. There would be very minimal difference from that. I have no issue doing the work to install the gears and make things work properly. I have already done the calculations for the rpm and speed but having a speedo that works correctly is always nice

Timspony

I just used the 23-tooth with my 3.73's...was a little off as stated!!!

AdderMk2

LMR is the ****tiest company ever, their chart is WAY the **** wrong.
All I need to know is wat gears you have, what type and what year your trans is

Post that and ill give you the right info

Stop posting, seriously. I like you, but you are really starting to **** me off.

Shelty, LMR doesnt have techs.. they have some desk jockey that gets paid $7/hr to read some pre-typed bull****.

also, the wheel size has NOTHING to do with speedo accuracy... its all about the OVERALL DIAMETER of the rear tires.

projectresto83

Adder you quoted the info.

FRPP 3.73's
93 T5

Thank ya buddy!
Right now the speedo is just about 10mph fast. As far as I know the drive gear inside hasn't been touched. Right now the black 20 tooth is on the cable for the 3.08's that were in the car.
http://www.latemodelrestoration.com/...ear-Kit-Manual

AdderMk2

The reason I asked is because I didnt know your car was a 5 speed.

AAANYway..... Assuming your T5 is a 93 model, your will have a 8T drive gear on the output shaft, The maximum gear you can correct for without ripping the trans apart (which isnt hard) is 3.55's. That would require you to use the Jeep 23T white speedo gear.

Now if you want your speedo to be correct, you will need to remove the tailshaft housing and swap the gear to either a 6t or 7t gear.

a 6T(black) drive gear will require a 18T(yellow) speed sensor gear
a 7T(yellow) drive gear will require a 21T(red) speed sensor gear

projectresto83

Awesome, thanks Adder. How many teeth do the older T5's have? I just remembered I have a busted T5 sitting in the back of the 83 that I can check the drive gear on...

92FourNine

I just put the red 21T in my 92. Got it close enough that it doesn't completely bother me. I didn't really have the resources to pull my tranny at the time, though.