[DeTomaso] ZF shifting problem

[Asa Jay Laughton]

Ah, that’s one I hadn’t thought of Julian, thank you.  I may have to pull the ZF to check it but if I pull the ZF to look at the clutch, well, I’m there.

;)
Asa  Jay

Sent via radio waves

> On Sep 12, 2022, at 17:35, Julian Kift <julian_kift at hotmail.com> wrote:
> 
> This reminds me of the issues I had with the freshly rebuilt (by Dennis Quella) ZF in the GT5 when I purchased it. Dennis drove the car at Pahrump and we agreed to pull the ZF and send back to him. He went back through it finding nothing wrong and as you’d expect nothing improved once it was reinstalled. He then asked if I had an Oilite pilot bushing and upon a ‘yes’ sent a roller bearing. Once installed all my shifting issues disappeared and have been good for the 15 years since!
> 
> Julian
> 
>> On Sep 12, 2022, at 15:41, Asa Jay Laughton via DeTomaso <detomaso at server.detomasolist.com> wrote:
>> 
>> Hi John,
>> The trouble is the Pantera disc is thin compared to other applications people used to source parts from.  If you ask for a disc for a 1971 mustang, it may be the right size but will be the wrong thickness.  Asking for a Mustang pressure plate carries a similar problem due to different bob-weights that will hit the interior of a ZF bell housing.
>> 
>> If the disc is too thick, there might be just enough clearance when cold, but not enough when hot.  That is my theory anyway.
>> 
>> I might be all wet on that but I’m certain the DeTomaso collective has experienced this problem before and will have other ideas.
>> 
>> Asa  Jay
>> 
>> Sent via radio waves
>> 
>>>> On Sep 12, 2022, at 15:30, John Donahue <demongusta at gmail.com> wrote:
>>> 
>>> Would a clutch disc be that sensitive to operating temperature?
>>> 
>>>>> On Sep 12, 2022, at 3:21 PM, Asa Jay Laughton via DeTomaso <detomaso at server.detomasolist.com> wrote:
>>>> 
>>>> Hi All,
>>>> I just had a call with Mark Mead in Spokane.  Mark has a 1974 Pantera.  He had restoration done somewhere else and now has a problem with the ZF.
>>>> 
>>>> ZF was rebuilt by RBT.  I don’t think the problem is the ZF.  It’s either the gear lube or the clutch.
>>>> 
>>>> Symptoms:
>>>> Cold drive all good, shifting fine.
>>>> After warm up, it will no longer come out of gear like the clutch is not disengaging.
>>>> 
>>>> The place that put the ZF in, used Valvoline synthetic 75-90 gear lube. That’s all he knows.  New master and slave, but not sure about clutch disc or pressure plate.
>>>> 
>>>> I am out of town heading to SSCC with Mad Dog.  I will be troubleshooting Mark’s car when I get back from  all my trips at the end of September.
>>>> 
>>>> In the meantime, I am looking for opinions about the Valvoline synthetic 75-90.  Mark has talked to Drew Backlund, -THE- Pantera guy in Spokane from the 70’s and 80’s.  Drew hasn’t worked on Pantera’s in about 30 years but he has Mark convinced that Redline 75-90 is the -only- gear lube that will actually work.
>>>> 
>>>> I know it’s one of the best but I need a new refresher on the topic of lubes. Would using the Valvoline cause this issue?  I’m thinking it might be an incorrect clutch disc, not so much the fluid but I won’t know more until late this month when I can touch the car.
>>>> 
>>>> What do we think?
>>>> Thank you,
>>>> Asa  Jay
>>>> 
>>>> Sent via radio waves
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