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Re: Exhaust fixed... tranny woes? Posted by CMyles [Email]  (#1126) [Profile/Gallery]
(more from CMyles) on Sun, 4 Dec 2005 12:17:15
In Reply to: Exhaust fixed... tranny woes?, RaduP, Sat, 3 Dec 2005 11:25:44 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Analyzing an automatic transmission problem like this is a kind of involved process. A number of internal problems can cause a loss of forward drive in T-37's. Once engaged does the transmission remain engaged, upshift and downshift through all three forward gears properly? Does shifting into and out of drive cause a repeat of this "momentary motion". I rebuilt a lot of T-37's but it's been a while. I recall that the servos which engage the bands, one of which is the low/reverse band, would often break their sealing rings and stick in their bores. Among the few things that can be fixed without pulling the unit are valve body problems, (and you may have a sticking valve), and loose oil pipes. This tranny has about 13 small oil pipes which can be accessed from below via the cover plates, but they are held pretty well and rarely come loose. Has the unit been severly smacked on the bottom? You must remove the tubes to get the valve body out and it's not a job for a novice or even a tranny guy that's unfamiliar with T-37's. Check the obvious stuff first; Throttle pressure cable, ATF level (and these use type F, not Dexron) and Shift linkage adjustment. Shift linkage maladjustment will very quickly rip the teeth from the planetary gears. Check the band adjustments. Trust this to a Saab specialist also as it is properly done with Saab special tools and spec's. How many miles on this tranny? (Tightening bands on worn out tranny's is usually pointless as the friction material is shot).
If you must replace the transmission Eriksson Industries of Old Saybrook, CT is the best source for a rebuilt unit that I know of. Be real sure that the installer adjusts the shift linkage as per the Saab section 4 manual. (Get a Saab shop for the job). Bear in mind that if you go with a salvage tranny you are risking a lot of labor on the R and R with an unknown unit.
One more thought. On occassion the splines can come off of a companion flange (aka. stubb axle or inner driver) where it plugs into the final drive. This generally results in a complete loss of all motion including reverse but it's such an easy fix that you should rule it out before pulling the unit. Good luck.
posted by 206.123.221...
, Sun, 4 Dec 2005 12:17:15 <-- Viewing This Message, Mon, 5 Dec 2005 14:58:04, Mon, 5 Dec 2005 20:34:11, Wed, 7 Dec 2005 02:22:31
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