../../ Mon, 06 Sep 2010 00:14:32 -0400 MyBB ../../showthread.php?tid=189 Tue, 24 Nov 2009 11:22:11 -0500 ../../showthread.php?tid=189
Before the tranny swap, I had a speedo gear that worked fine with the 3.73's. Since the tranny swap, we've tried a couple of different speedo gears, but the speedometer is mis-calibrated ... it reads faster than the car is actually traveling.

I've been told by one source that the 4r70w's in '03 Mustangs have a different tailshaft than the T-bird had - one has a 7 spline shaft, one has an 8 spline shaft and to be able to get the speedometer properly calibrated, I need to either swap tailshafts, or use the FRPP auto speedcal.

Another source says that it isn't the tailshaft spline gears that are different, it is a gear inside the transmission that has to be changed.

Can someone give me the straight poop on what the differences are between the T-bird 4r70w and the later model 4r's that cause the speedometer calibration problem?

Thanks.

-mike]]>
Before the tranny swap, I had a speedo gear that worked fine with the 3.73's. Since the tranny swap, we've tried a couple of different speedo gears, but the speedometer is mis-calibrated ... it reads faster than the car is actually traveling.

I've been told by one source that the 4r70w's in '03 Mustangs have a different tailshaft than the T-bird had - one has a 7 spline shaft, one has an 8 spline shaft and to be able to get the speedometer properly calibrated, I need to either swap tailshafts, or use the FRPP auto speedcal.

Another source says that it isn't the tailshaft spline gears that are different, it is a gear inside the transmission that has to be changed.

Can someone give me the straight poop on what the differences are between the T-bird 4r70w and the later model 4r's that cause the speedometer calibration problem?

Thanks.

-mike]]> ../../showthread.php?tid=81 Tue, 08 Jan 2008 14:03:55 -0500 ../../showthread.php?tid=81
Do you or Steve remember exactly what you did to make it work on my Mark? If yes, could you please post a list of parts/numbers needed to do the mod, so I can send the Mark guys here to see how to get it done?

Many thanks!

Mike.]]>
Do you or Steve remember exactly what you did to make it work on my Mark? If yes, could you please post a list of parts/numbers needed to do the mod, so I can send the Mark guys here to see how to get it done?

Many thanks!

Mike.]]> ../../showthread.php?tid=71 Wed, 05 Dec 2007 15:11:26 -0500 ../../showthread.php?tid=71