TRNW-2: 4R70W question.

[Dan Hogan]

If you use the matching rear ring gear and sensor, I agree this should work fine.  Like Pat, I've also seen transition cases with both holes and a dummy plug present in the turbine shaft side for the years prior to officially using the input speed sensor.




---


Dan Hogan

Buster's Transmission Service

https://busterstransmission.com

704.847.5321

________________________________
From: trnw2-bounces at trnw.net <trnw2-bounces at trnw.net> on behalf of pat schulte via trnw2 <trnw2 at trnw.net>
Sent: Friday, November 7, 2025 11:25 AM
To: Ryan D <ryan4r100 at gmail.com>; Technical Discussion Forum <trnw2 at trnw.net>
Subject: Re: TRNW-2: 4R70W question.

I can't tell you for sure as I have never tried, but I have seen some units come in where the hole where the input sensor would go have a plug from the factory. I "think" the output sensor hole is in the same place, instead of reading the holes in the carrier it reads the park lugs, but the lugs were made longer to be in the correct position.

On Fri, Nov 7, 2025 at 8:15 AM Ryan D via trnw2 <trnw2 at trnw.net<mailto:trnw2 at trnw.net>> wrote:
Fred

The input speed sensor won't be used. I'm thinking that one won't matter. The output sensor could be a problem.  the shop is bringing me a core they have today so I can look at it. Thank you guys for your thoughts on this.



On Friday, November 7, 2025, Fred Whitaker via trnw2 <trnw2 at trnw.net<mailto:trnw2 at trnw.net>> wrote:
  Guys, The sensor reads in a different spot in the case. Thats why you have to pull a late one back out if you clock the center support snap ring wrong. The out put sensors are different part #s as well!
________________________________
From: trnw2-bounces at trnw.net<mailto:trnw2-bounces at trnw.net> <trnw2-bounces at trnw.net<mailto:trnw2-bounces at trnw.net>> on behalf of jbockus--- via trnw2 <trnw2 at trnw.net<mailto:trnw2 at trnw.net>>
Sent: Friday, November 7, 2025 6:56 AM
To: Ryan D <ryan4r100 at gmail.com<mailto:ryan4r100 at gmail.com>>; Technical Discussion Forum <trnw2 at trnw.net<mailto:trnw2 at trnw.net>>
Subject: Re: TRNW-2: 4R70W question.

I would say yes as long as you use the planetary and rear speed sensor
from your original 1-sensor case. I'm sure the sensors are the same
diameter and depth. And just plug the front sensor hole with a speed
sensor. That will throw someone off down the line, lol

On 2025-11-06 10:49 pm, Ryan D via trnw2 wrote:
> Can I use a 2 speed sensor case in place of a one speed sensor case on
> a 4R70W? Both have 3 bolt starters.
>
> --
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Ryan
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--
Pat Schulte
AAMCO Transmissions
Temecula, Ca.
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