ST-300 questions and durability
November 20th, 2012, 11:42 PM
#1
New 2 Olds
Thread Starter
Join Date: Feb 2012
Location: New York
Posts: 205
ST-300 questions and durability
I have a few questions about the "switch pitch" as I have one in my daily driver. Is it hard to find a good rebuilder of these vs the more common TH-350/200r4 models? How long do these usually last before they start slipping? What's a common weak spot with them? My trans has 115k on it and other than needing a tailshaft bushing and various external seals, works fine (which amazes me for it's age)but would like to see what everyone has to say.
November 21st, 2012, 06:45 AM
#3
Old(s) Fart
Join Date: Mar 2007
Location: Northern VA
Posts: 47,451
Easier, actually. It has fewer parts.
I do prefer more speeds with a steeper first gear, however. The 200-4R is a nice replacement for the Junkaway, and the 2.74:1 first is a big improvement over the 1.7:1 first (even with the switch pitch engaged).
I do prefer more speeds with a steeper first gear, however. The 200-4R is a nice replacement for the Junkaway, and the 2.74:1 first is a big improvement over the 1.7:1 first (even with the switch pitch engaged).
December 13th, 2012, 12:15 PM
#7
Just the facts...
Join Date: May 2008
Location: THE GREAT WIDE-OPEN
Posts: 1,259
i never had a problem with mine, other than seals being old and hard. pulled it from my '69 with 171k on the clock, tranny worked fine(for what it was). the one from the '67 was working fine too, when it was pulled at 64k. the advantage of a real first gear is why i changed to a thm400, and the 425 helped that decision come about.
bill
bill
December 15th, 2012, 07:39 AM
#9
Old(s) Fart
Join Date: Mar 2007
Location: Northern VA
Posts: 47,451
On the drag strip, every upshift represents a fraction of a second when the car is not accelerating. IF the engine's powerband, vehicle weight, tire size, and axle ratio are properly matched, a two-speed car will be marginally quicker than one that requires more shifts over the same quarter mile. That DOESN'T mean that the same car is preferred on the street, however. For street driving you need to maximize vehicle flexibility. More gears give you that flexibility.
December 15th, 2012, 10:39 AM
#10
Hot Rod Has Been
Join Date: Dec 2012
Location: Central Wisconsin
Posts: 339
Not funny at all if you understand physics. A two speed would also be preferred on the street if your street driving was restricted to only a quarter mile at a time at max acceleration in a straight line.
On the drag strip, every upshift represents a fraction of a second when the car is not accelerating. IF the engine's powerband, vehicle weight, tire size, and axle ratio are properly matched, a two-speed car will be marginally quicker than one that requires more shifts over the same quarter mile. That DOESN'T mean that the same car is preferred on the street, however. For street driving you need to maximize vehicle flexibility. More gears give you that flexibility.
On the drag strip, every upshift represents a fraction of a second when the car is not accelerating. IF the engine's powerband, vehicle weight, tire size, and axle ratio are properly matched, a two-speed car will be marginally quicker than one that requires more shifts over the same quarter mile. That DOESN'T mean that the same car is preferred on the street, however. For street driving you need to maximize vehicle flexibility. More gears give you that flexibility.
December 15th, 2012, 02:15 PM
#11
Old(s) Fart
Join Date: Mar 2007
Location: Northern VA
Posts: 47,451
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