AODE Speedo gear in a 4R70?

01yellercobra · Apr 3, 2018

We're going to be swapping rear ends in my son's car this weekend. The new rear end has 3.73's in it. My research shows I need a 23 tooth speedo gear. But the ones I've found are listed for AODE. Will those work in the 4R70?

McCloud · Apr 3, 2018

01yellercobra said:
We're going to be swapping rear ends in my son's car this weekend. The new rear end has 3.73's in it. My research shows I need a 23 tooth speedo gear. But the ones I've found are listed for AODE. Will those work in the 4R70?

Will they install in a 4R70W? Yes they will. Will it correct the speedo? For a little while until the gear strips. Best to go with a speedcal or other electronic correction unit.

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01yellercobra · Apr 3, 2018

Didn't know they were that bad. I didn't have that issue in my 98. But it was a manual. The plan is to get his ECU strategy added to my dongle so I can tune his car. But I wasn't ready to start that process.

Silver95bird · Apr 4, 2018

23 tooth gears are like pushrod motor tfi modules- keep a spare in the glove box.

01yellercobra · Apr 4, 2018

Would anything bad happen to the trans if he has to drive it a couple weeks with the speedo off while I get the software together? Will it mess up the shifts or anything?

McCloud · Apr 6, 2018

01yellercobra said:
Would anything bad happen to the trans if he has to drive it a couple weeks with the speedo off while I get the software together? Will it mess up the shifts or anything?

It will be fine. I drove mine around with a stripped gear for awhile. It may alter the shifts somewhat but nothing major.

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01yellercobra · Apr 6, 2018

McCloud said:
It will be fine. I drove mine around with a stripped gear for awhile. It may alter the shifts somewhat but nothing major.

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Cool. I need to get the strategy so I can add the car to my software. And naturally I only think about it when I'm at work.

01yellercobra · Apr 20, 2018

McCloud said:
Will they install in a 4R70W? Yes they will. Will it correct the speedo? For a little while until the gear strips. Best to go with a speedcal or other electronic correction unit.

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So reading this again I may have missed something. Is the only way to correct the speedo is with the speedcal or something similar? It can't be adjusted in the tune itself? I'm used to tuning 01+ cars.