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Jon Wood · 02-15-2005, 01:26 PM

Does anybody know if the corvair 4-speed tranmission section will bolt into the tempest transaxle? I've noticed that the shifter style is the same and the case looks very similar. (I am only talking about the section that has the transmission, not the differential/bellhousing section) Has anybody done this??

Jon Wood · 02-15-2005, 01:26 PM

Does anybody know if the corvair 4-speed tranmission section will bolt into the tempest transaxle? I've noticed that the shifter style is the same and the case looks very similar. (I am only talking about the section that has the transmission, not the differential/bellhousing section) Has anybody done this??

tom s · 02-15-2005, 01:39 PM

why not buy a tempest 4 speed?It will only hold up to the 4cyc.The 326s came with a 3 speed or auto only.The corvair will be no stronger than the tempest 4 speed.Tom

Jon Wood · 02-15-2005, 02:30 PM

Haven't been able to find a Tempest 4-speed, but I see the corvair units for sale very often (relatively speaking, that is...) Do you have a source for a Tempest 4-spd transaxle?

tom s · 02-15-2005, 02:39 PM

Jon,what engine do you want to put in front of it?Try Ken at East West auto in Olk.NOT cheap but usually has what you need.Tom

Jon Wood · 02-16-2005, 03:06 AM

Just the 4 cyl.
Although if all goes well, it will be getting a T3 turbo I salvaged from the junk yard within the next 6 months...
By the way, thanks for the lead.

tom s · 02-17-2005, 08:06 AM

Jon,if your going to up the HP,I would put the 326 3 speed drive train behind it.Tom

Jon Wood · 02-17-2005, 10:21 PM

Even with the turbo, torque should stay under 300 ft lbs, probably more like 275 foot lbs max. Is that too much? I have no experience with these transaxles...
I'm used to tinkering with the big cars

SDStanley · 03-06-2005, 04:30 AM

66 through 69 Corvair four speed transmissions were much stronger compared to the 60-65. These were based on the Saginaw four speed internals.
Will the late Vair four speed fit? I intend to find out- I have a 63 LeMans 326/auto which is almost ready, and my parts car is a 326/3 speed. I want to change the automatic car over to a manual and will see if it's possible to use a late Corvair four speed. I have an early Corvair four speed transmission I can use but- no drag racing allowed with that transmission!

tom s · 03-06-2005, 07:23 AM

the REAL week link is the ring and pinion gear!IF your going up on HP I would stay with the auto as the converter is like a shock absorber for the diff.I have a Xtra R&P and will post a pic.It is unbelieavable how small they are.Tom

63Banshee · 03-06-2005, 11:10 AM

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by tom s:
the REAL week link is the ring and pinion gear! </div></BLOCKQUOTE>
cryo treatment.

tom s · 03-06-2005, 11:13 AM

dont you think the factory did EVERYTHING possibel to make the SD trans axles live?Just too small a gear.

tom s · 03-06-2005, 11:15 AM

that is a pic of the ring gear in relation to a tripower base!ANYMORE ideas?Tom

63Banshee · 03-06-2005, 12:58 PM

I don't think anyone cryo treated anything in the 60's for a SD car, much less a production car.

I'd run 400+ gross HP on that gear in a 3000 lb race weight car after treatment. No worries. In fact, I'd say it's not much crazier then running 650 HP through a stock MOPAR 8 3/4 in a 3800 lb race weight car. Been there done that.

Someone less lazy than I will have to do the math.

tom s · 03-06-2005, 05:37 PM

I was told by a engineer that the other problem is the design is bad for wear,the pinion is at the bottem of the gear.Im going to put 325HP in front of one and am REALLY worried about holding up.Tom

jusjay · 03-06-2005, 09:54 PM

Just a thought, why not try one of the newer Tranaxler for high HP sport racer. Jay
http://www.fortinracing.com/transaxles.html
http://shop.store.yahoo.com/jtdesigns/cncmafrbirat.html

Jon Wood · 03-06-2005, 11:15 PM

Interesting info...
SDStanley, please keep me posted on your later corvair transaxle upgrade, that seems like possible solution.
63 Banshee,
Do you know how much the cryo treatment improves the fatigue strength?

tom s · 03-07-2005, 08:07 AM

Jay,both of those are for mid or rear engine setups.Im sure with work you could adapt the TQ tube to one.Tom

63Banshee · 03-07-2005, 09:26 PM

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Jon Wood:
Interesting info...
SDStanley, please keep me posted on your later corvair transaxle upgrade, that seems like possible solution.
63 Banshee,
Do you know how much the cryo treatment improves the fatigue strength? </div></BLOCKQUOTE>

It will turn a '59 Forged Pontiac rod with a Rockwell rating of 18 into a '59 Forged Pontiac rod with a Rockwell rating of 35... roughly. That is after about 24 hours. The best part about this technology is that the hardness is to the core, if allowed the time to "cook." Other methods only treat the outside layer.

Motornoggin · 03-08-2005, 11:05 AM

IIRC, the Corvair Van four speed/trans axles are what you need to look for for the Tempest. They have extra spiders and stronger gear sets. I don't know that the Corvair car boxes will fit?

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