We have made a conversion for the 4 speed Fiero transaxles using straight cut spur gears with "Dog Clutch" engagement. These conversions are intended for Racing. Our design would not allow a 1st gear ratio much lower than 2.69 : 1. The other ratios are within the range we can produce. We no longer inventory these conversion kits, but will be happy to quote on a special order basis.
Thanks for your interest. Mike Ruckman Webster Gears Inc. Ph: 415-388-1494 e-mail: webgears@aol.com
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03:03 PM
PFF
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ducattiman Member
Posts: 674 From: TheNetherlands Registered: Mar 2003
the dog isn't the negative part really so much as the straight cut spur gears - this means a gear whine at all speeds just like you hear when you watch rally races on tv -- benefit is no thrust loating on the gears so the bearings last a lot longer.
[This message has been edited by Kohburn (edited 10-21-2004).]
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05:20 PM
Howard_Sacks Member
Posts: 1871 From: Cherry Hill, NJ Registered: Apr 2001
if you don't match in a dogbox, pretty soon you won't have gears.
quote
Originally posted by Kohburn:
in simplified form as i understand it dogbox gears have large gear lash so you can slap it into gear without a clutch (still should match engine speeds a bit)
the dog isn't the negative part really so much as the straight cut spur gears - this means a gear whine at all speeds just like you hear when you watch rally races on tv -- benefit is no thrust loating on the gears so the bearings last a lot longer.
"Dog engagements specifically designed using a "deep 5 dog" for fast and smooth shifting. While shifting a dog box still takes some technique, shifting is solid, and engaging the next gear is extremely easy without having to perfectly rpm match. *While full throttle shifting is this transmissions forte, double clutching during everyday use will result in quiet shifts that do not require rpm matching and will increase dog ring life. This is easy and becomes second nature in no time. "
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05:28 PM
collinwestphal Member
Posts: 698 From: Waukesha, WI, USA Registered: Jun 2003
I wonder how much it would cost to do a dog engagement 1-2 set... or maybe a gearset with a significantly taller dog engagement 1st and synchromesh 2nd.
------------------ Turn the key and feel the engine shake the whole car with its lope; Plant the gas pedal and feel in your chest neither a shriek nor a wail but a bellowing roar; Lift and be pushed into the harness by compression braking that only comes from the biggest cylinders while listening to music of pops and gurgles. Know that you are driving an American V8. There are finer engines made, but none of them are this cool.
Luck, Fate and Destiny are words used by those who lack the courage to define their own future
So this would mean a completely new input shaft because gears 1 & 2 are machined into the shaft itself.
I like the idea of straight cut gears for the first 3 if they can hold up to some torque, but it'd be nice to have a quiet highway gear. For those who wonder what a straight cut gear sounds like, drive your car in reverse and listen.
Personally, I've given up on the idea of a stronger muncie. Everything in it is designed for a low horsepower engine, from case to gear width to differential size.
It would be nice to see somebody actually go through with this, but I can't see spending thousands on custom gearing and still having a weak-ish trans.
-Tim
------------------ 84 Fiero, 3800SC Series II,4spd manual 12.90 @ 108.9mph
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08:46 AM
Will Member
Posts: 14254 From: Where you least expect me Registered: Jun 2000
To my knowledge any 4 speed transaxle can be used with our conversion kit. This "Kit" was developed in conjunction with Pontiac in 1984 for use in the Fiero's that were raced in the S. C. C. A. Trans AM series. There are no modifications necessary to the case. Pontiac offered a Transmission Case & Assy. Kit, P.N. 10042330 that was used with our conversion to build a transaxle.
To produce these Kits today would cost in the range of $3700 to $4200 each, depending on the quantity ordered.
Originally posted by TimGully: Personally, I've given up on the idea of a stronger muncie. Everything in it is designed for a low horsepower engine, from case to gear width to differential size.
It would be nice to see somebody actually go through with this, but I can't see spending thousands on custom gearing and still having a weak-ish trans.
-Tim
You must be talking about something else. the fiero muncie transaxle is...dare i say...as strong if not stronger than the 'beloved' getrag tranny.
My poor little 4.10 muncie took 130,000 kms of hard shifts, REAL launches and fat tires before it finally locked up in 4th. Which I gladly swapped it out for another one without even a flinch...My motor may be only a 230hp V6 but it revs to 6500 and takes the tranny with it.
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