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#1
10-07-2018, 01:39 AM
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Tranny, what did I break this time?
Well, true to form, I did my every other year transmission break. Racing tonight in the hard tire finals, something let go in the tranny. The car does not have reverse or neutral. I had a few guys try to help me push it back on the trailer a bit but all they did was elevate the front end. I will have to pull the driveshaft in order to get it off the trailer. Any thoughts? Tranny is a RVB TH400.
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 Johnny US Army Retired1978 T/A 463 Pontiac, KRE 74cc 292CFM D-ports, Lunati VooDoo, V-max lifters, TKII, ATM 850 E85 carb, TCI TH-350 race tranny, 3600 converter 3.73 12 bolt 11.63@116.68mph 1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car. 1980 Formula 350 Pontiac back burner project 1972 LeMans 350 Pontiac |
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#2
10-07-2018, 11:12 AM
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if you can't push it back with car turned off and not in park i'm going to say planetary gears
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#3
10-07-2018, 08:40 PM
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No idea from me since a RVB was installed. Anything from a Gasket leak to hard part failure.
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#4
10-08-2018, 02:57 PM
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I called the tranny builder today, he "suspects" I melted the clutches together. Thinking about it, I wonder if I hurt it during my by-run. It was getting pretty cold and I decided to launch the car in 2nd on nitrous for the first time. Quite honestly, I didn't realize I had a problem until trying to load up and I have no reverse or neutral. I had to pull the car awfully far forward to get it straight w/o reverse, taking it off the trailer is going to be a whole lotta fun...
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Johnny US Army Retired1978 T/A 463 Pontiac, KRE 74cc 292CFM D-ports, Lunati VooDoo, V-max lifters, TKII, ATM 850 E85 carb, TCI TH-350 race tranny, 3600 converter 3.73 12 bolt 11.63@116.68mph 1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car. 1980 Formula 350 Pontiac back burner project 1972 LeMans 350 Pontiac |
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#5
10-08-2018, 03:46 PM
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Smell the fluid on the dip stick. If clutches/steels are welding to one another, it should smell pretty burnt.
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Jack Ferris RestoRacing LLC www.restoracing.com Sandy, UT --------------------------------------------------- |
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#6
10-08-2018, 06:40 PM
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Once, I broke a pump sealing ring and did not realize it. Just a 1/4" piece. Trans seemed OK. But the first time I tried to do a burnout on the line I melted the front clutch pack into a sagging heap. It smelled discussing, worse than burnt. It was so bad I did not want to deal with that section. Grabbed another out of a spare trans and used it.
Also, last time I drank a beer and worked on my car. |
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#7
12-07-2018, 12:37 AM
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69Camarox was the winner/correct. I did trash the planetary gearset, makes for a nice conversation piece...
__________________
Johnny US Army Retired1978 T/A 463 Pontiac, KRE 74cc 292CFM D-ports, Lunati VooDoo, V-max lifters, TKII, ATM 850 E85 carb, TCI TH-350 race tranny, 3600 converter 3.73 12 bolt 11.63@116.68mph 1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car. 1980 Formula 350 Pontiac back burner project 1972 LeMans 350 Pontiac |
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#8
12-07-2018, 10:12 AM
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...never seen a TH400 planetary failure.
Really want to know the cause ( missing thrust washer?, 4- pins lossened up?...) |
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#9
12-07-2018, 04:10 PM
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[QUOTE=Half-Inch Stud;5964143]...never seen a TH400 planetary failure.
First for me too...
__________________
Jack Ferris RestoRacing LLC www.restoracing.com Sandy, UT --------------------------------------------------- |
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#10
12-07-2018, 05:39 PM
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It was a 2.74 1st gear which I understand are weaker. I launched the car on the bottle in 2nd gear by mistake (ratchet shifter).
__________________
Johnny US Army Retired1978 T/A 463 Pontiac, KRE 74cc 292CFM D-ports, Lunati VooDoo, V-max lifters, TKII, ATM 850 E85 carb, TCI TH-350 race tranny, 3600 converter 3.73 12 bolt 11.63@116.68mph 1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car. 1980 Formula 350 Pontiac back burner project 1972 LeMans 350 Pontiac |
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#11
12-07-2018, 10:13 PM
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Quote:
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