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I'm topping off my 727 auto transmission fluid level and not sure which trans fluid to use. The transmission has been rebuilt with a shift kit. Fluid level's a little low and want to use some good fluid recommended for the Mopar. Any suggestions? Thanks in advance...

Thanks for your help. It's working spot on now!

Checked it out and lined up correctly...

Thank you for your help... appreciate it.

That's sounds like a good possibility on why it wasn't accurate. Just glad it's working now...

Thanks!

Working perfect now!

Working perfect now!

Took the car out for a ride this morning with the gps just because. Everything was still the same. Accurate up till 25mph, and speedometer needle bouncing a little bit under 10mph. And the speedometer reading much higher than the gps after going faster 25-30mph and up. I don't know what...

That's what I was afraid of...Thanks for your help. Appreciate it.

That's correct. Checked it out last night. Thanks.

Checked it out and that setting is correct. The tire height is 25.5 inches. Took the car out again late yesterday afternoon . The speedometer is very accurate to 25mph (gps) and then starts creeping up faster on the speedometer compared to the gps. Reads 35 when doing 30. Seems like about 1.5...

Did that and I got 25.5 inches...

Did that last night. Spped is spot on until 25 mph then slowly reads faster than actual speed up from there. Example: 30 mph on gps reads 35mph on speedometer. 70 mph on speedometer reads 57 on gps. The odometer however is SPOT ON. Our highways are one mile apart and the odometer was dead nuts...

Great info! Thanks for sharing...

Thanks a million. I'm going to check that out.

Will do! Thanks...

Thank You!

Math has never been simple to me (lol) but I get what you're saying. What would you do? The speedometer was working correctly before the engine/rear end swap and the shop that replaced the rear end gears swears it's a 3.91

I'm going to double check that. I think so but I'm not sure... I've asked that question to Mancini, my transmission builder and another trans shop and they said it shouldn't make a difference. I've also read online that if clocked incorrectly it would put more pressure on the driven gear if that...

I hope not. I'm going to replace the 40T with a 41T and see what the difference is. Hopefully closer in speed accuracy and leave it at that...

Ouch. I sure hope not but who knows? The transmission shop here in Michigan didn't know tooth count /mph difference and referred me to this place...

Thanks... I'll get there. I did find out today however that one tooth equates to 3mph on the speedometer. Talked to a tech guy at A and A Transmission in Indiana. Mancini didn't know...

Close to it. I don't remember the exact numbers. Speedometer is accurate to about 12mph, then the faster the speed the higher it is off. Doing 50mph (per gps) the speedometer was reading 62mph. Had the rear end rebuilt a couple of years ago and was told it's a 3.91 gear... I was thinking about...

Thank you. The speed was spot on until above 10 mph. Then it increased. You're right. when the speedo was reading 62mph the gps was reading 50mph. Do you know what the mph difference reading on the speedo would be by going up 1 tooth, generally speaking?

Great info. Thanks...

Thank you so much! Numbers are not my strong point...

Thank You...

Thanks. That's what I was thinking (41T) before buying the the 40T but Mancini insisted it was a 40T

My mistake. The driven gear I pulled was a 27T ... The rear tire size is P225/60R15