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  Soarer Central * Transmission * V8 Auto - Small clunk when down shifting? Previous Previous    Next Next  

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Mark Ribbans
Tinkerer
SA
UZZ-031 V8

Posts: 65
Reg: 07-2005

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Tuesday, May 23, 2006 - 05:51 pm, by:  Mark Ribbans (V8gtsoarer) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

My cars transmission occasionally (say 1 in 4) clunks when automaticaly shifting down gears (say pulling up to red light) at about 20 km/h.

I had my trans fluids changed about 1 year ago.

Any ideas or is she just getting a little tired?
Clayton Webb
TryHard
South Australia
'31 V8

Posts: 296
Reg: 09-2005

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Tuesday, May 23, 2006 - 06:07 pm, by:  Clayton Webb (Clackers) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Trans mount, engine mounts, diff bush. Don't know really. Have you tried loosening the line pressure screw for the trans?
Mark Ribbans
Tinkerer
SA
UZZ-031 V8

Posts: 67
Reg: 07-2005

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Wednesday, May 24, 2006 - 05:42 pm, by:  Mark Ribbans (V8gtsoarer) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Quote:>Have you tried loosening the line pressure screw for the trans?

The what? Where is that and how do i do it..
Peter Nitschke
JunkFilterer
South Australia
GT4.0 V8

Posts: 4746
Reg: 11-2004

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Thursday, May 25, 2006 - 03:53 am, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Do a search for LPS. It's been covered a few times complete with pics :-)
Damien Smith
DieHard
NSW
Manual UZZ31

Posts: 579
Reg: 07-2005

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Thursday, May 25, 2006 - 01:27 pm, by:  Damien Smith (Damien) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

This is it...


Upload
Ashley Leach
Tinkerer
South Australia
V8 GT Limited

Posts: 49
Reg: 02-2006

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Tuesday, June 20, 2006 - 05:12 pm, by:  Ashley Leach (Ashlar) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Mine had the same problem. I took it to MV Auto's and got the trans mount replaced. Diff noise travels up the tail shaft and transfers onto the body.

Could be that.
Braden Murdoch
Tinkerer
NSW
Cressida 1JZ TT

Posts: 57
Reg: 04-2006

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Wednesday, June 21, 2006 - 08:56 am, by:  Braden Murdoch (Ribfeast) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I had the same issue, it would shift down really harshly as I rolled to the lights. Mainly happened if I'd just been giving the car some right foot action. Felt as if you were in a manual car, downshifting to first and letting the clutch out too quickly.

I bought a different tranny cooler and made it so the lines aren't pushing the fluid uphill too much. It might have been caused by a restrictive tranny cooler too, but the old one was much thicker so I'm not sure if that was the cause.

Adjusting the kickdown/line pressure cable didn't have any effect for me.

I was amazed by the difference! I need a new trans mount too though I reckon.

My theory is that the tranny's fluid pump couldn't push the fluid up through all those lines and the cooler, and was starving the transmission when you were giving it some stick, maybe flinging vital fluid away from the 1st gear area.
Mark Northcott
TryHard
NSW
UZZ30

Posts: 437
Reg: 10-2005

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Friday, June 23, 2006 - 01:27 am, by:  Mark Northcott (My91gt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

OI i was listening today to my new diff and every time I put it in reverese or into gear it would clunk doesn't do it now the diff center has been changed.

Unsure if it done it while driving as I couldn't hear it over the exhaust.

I'm thinking drop the diff oil and count how many teeth come out.



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That is the damage that I had caused (After about 220km's of driving home) But I didn't take it easy.

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