Adjustable shift stops in aftermarket shifters when using Tremec Trans....FYI

[buening]

I contacted Tremec directly to determine if they recommend using the adjustable shift stops on aftermarket shifters. I got a response from them stating:

We do not recommend using “adjustable stops� on the Tremec Product Line.

I specifically mentioned the T-56 in my email, but replied asking if this also applied to other Tremec transmissions such as the T5 and TKO. I'll let you know if I hear back on that.

I've read online that many claim Tremec transmissions have internal shift stops, and by using the adjustable ones in the shifter one could possibly adjust them before the shifter reaches the internal shift stops.

 

[68EFIvert]

Re: Adjustable shift stops in aftermarket shifters....FYI

Thanks for sharing the information. I wonder why almost all aftermarket shifters have them if the mfg doens't recommend them? My guess is that once one company offers it then all the others need to do the same in order to sell them/ have a competitive product.

 

[buening]

Re: Adjustable shift stops in aftermarket shifters....FYI

I'm not sure. A helpful link that got me thinking about it: http://www.bullittarchive.com/3009.htm

Specifically:

NOTE:From Tremec dated 03/01

Tremec Transmissions
Service Bulletin 03.01

Subject:
After market Shifter Stops

Transmission Models Affected:
All
Severe damage may be caused by installing an after market shifter with "shift stops" on any TREMEC transmission. All TREMEC transmissions are designed and manufactured with built-in shift stops to prevent over shifting. Therefore; shift stops on after market shifters are totally unnecessary when used on a TREMEC transmission. TREMEC "TR series" transmissions have multiple shift rails with shift stops on the gearing. TREMEC "T series" transmissions have a single shift rail system with stops built into the guide plate.

When installing an after market shifter on a TREMEC transmission it is best to remove the shift stops to avoid miss adjustment, and the potential of the screws vibrating lose. A misadjusted shift stop can cause an under-shift, which may lead to a gear jump-out situation. If the transmission jumps out of gear, the shift fork can be bent causing permanent damage to the transmission. Shift forks can also be damaged by "clash shifting". A clash is caused by a missed shift.

Neither an "under-shift", nor a "clash shift" can be prevented by shift stops. TREMEC shift forks are designed to take loads up to 1,000 lbs. However, a gear jump-out may well exceed 1,000 lbs. of force, which may result in a permanently damaged transmission.

 

[66gt350]

To setup the shift stop on the Pro 5.0, you put the shifter in second gear and screw in the stop until it hits the shifter, then back off 0.010". So, on the Pro 5.0, the shifter shouldn't touch the stop.