Speedometer calibration

[batchman]

Cost of the gears is the tip of the iceberg. I'll bet you could find a C4 owner with 3.45 gear willing to pay you to swap pumpkins, especially if yours are quiet.

The only other thing to look out for is the condition of the limited slip. If you open yours to change gears you may as well rebuild the LSD. You want the Dana 44 HD kit from ring and pinion dot com.

[csavaglio]

Originally Posted by WVZR-1

If you do the procedure that I broke down in minutes it's a "single" rotation process. Done maybe "twice" to confirm but I've never had an issue where 10 rotations would have helped a thing. Of course you need to understand that I know some souls that can't count that high and are short some fingers and toes.

True that....... Sometimes it does make it easier when you're splitting hairs on gear ratios....the difference between 3.45 and 3.73 is only a quarter turn....the 10x method makes it easier to spot. Between 4.10 and 3.45, there should be no mistaking it either way.

Glad you got it figured out. Marc's a great guy to deal with. The ZR1 guys are lucky to have a lot of really good people to deal with.

Chris

[WVZR-1]

Originally Posted by batchman

Cost of the gears is the tip of the iceberg. I'll bet you could find a C4 owner with 3.45 gear willing to pay you to swap pumpkins, especially if yours are quiet.

The only other thing to look out for is the condition of the limited slip. If you open yours to change gears you may as well rebuild the LSD. You want the Dana 44 HD kit from ring and pinion dot com.

The gears the OP bought are for speedometer correction, the drive and driven for the transmission and the VSS. He's going to enjoy the 4.10 - I doubt he'd ever want to go back!

[batchman]

Originally Posted by WVZR-1

The gears the OP bought are for speedometer correction, the drive and driven for the transmission and the VSS. He's going to enjoy the 4.10 - I doubt he'd ever want to go back!

Doh! Of course. The cost was pretty close to the last Ford 8.8 R&P I bought though - threw me off.

I'd be enjoying 4:10s if my class rules allowed. Rock on!
- Jeff

[Pumpman]

The 4:10 rear end is just fine. A little slippery on wet roads. Don't need to go back to stock just fix the speedo. Bought the correct speedo drive gear set from Mark and put them in on Friday. Not too tough of a job although dropping the exhaust system is the only way to go. Had to clearance a seam a tiny bit to gain clearance to pull the drive shaft other than that a piece of cake. Did it easily w/o a second set of hands.
I did use a black marker pen and colored the side of the output shaft gear just above the key slot. This made it possible to locate the slot and align with the spring key in the output shaft. Snapped right into place easily once aligned.
Speedo is right on the money now.
I have fixed all the little problems and time to enjoy.

[WVZR-1]

Good to see all "went well" and as expected!