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998 vs 904 |
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KLW 
AMC Nut 
Joined: Sep/02/2012 Location: MN Status: Offline Points: 488 |
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 Posted: Aug/02/2021 at 7:40am |
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Thank you for the info. I believe the tranny I have is a 1982, but Ill have to check.
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1981 Spirit
(420 cu in stroker - 570 hp) 1966 Ford Fairlane Convertible (331 Cu In - 450 HP) |
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KLW
AMC Nut
Joined: Sep/02/2012 Location: MN Status: Offline Points: 488 |
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Posted: Aug/02/2021 at 7:50am |
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Yes, my tranny came out of a 1982 spirit 6 cyl. SOOOO, it should be a 998 lockup tranny, correct? also, do you happen to know the gear ratios for the "wide ratio" 998
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1981 Spirit
(420 cu in stroker - 570 hp) 1966 Ford Fairlane Convertible (331 Cu In - 450 HP) |
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mmerlinn
AMC Fan 
Joined: Jan/14/2013 Location: Here Status: Offline Points: 23 |
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Posted: Aug/15/2021 at 12:33am |
Lockup and nonlockup converters do not interchange. Design of input shaft is different, LU with a pilot, NOLU with no pilot. Also spline count difference, 26 versus 27. |
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purple72Gremlin
AMC Addicted
Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16614 |
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Posted: Aug/15/2021 at 4:23am |
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1979 TSM 904 is 4 and 6 cyl, non LU.
998 is LU and is V8 only 1980 TSM All 4 cyl use non LU 904. 2WD 6 cyl use 904 LU. Eagles use 998 non LU. Gear ratios for all above is 2.45, 1.45, 1.00. 1982 TSM All 4 cyl use non LU 904. All cars including Eagle. 2WD 6 cyl use 904 LU. Eagle with the 6 cyl use 998 LU.. Gear ratios.... 2.74, 1.55, 1.00. I do not have a 1981 TSM This is assuming your car is original. I have had a 1979 AMX, and it had a 1974 998. Also had a 1982 spirit with a 258, and the 904 was out of a different car and non LU And the spline count is different between the non LU and LU. And they dont interchange.
Edited by purple72Gremlin - Aug/15/2021 at 4:26am |
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KLW
AMC Nut
Joined: Sep/02/2012 Location: MN Status: Offline Points: 488 |
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Posted: Aug/15/2021 at 7:32am |
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does the 904 lu converter interchange with the 998 lu converter?
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1981 Spirit
(420 cu in stroker - 570 hp) 1966 Ford Fairlane Convertible (331 Cu In - 450 HP) |
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purple72Gremlin
AMC Addicted
Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16614 |
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Posted: Aug/15/2021 at 11:43am |
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KLW
AMC Nut
Joined: Sep/02/2012 Location: MN Status: Offline Points: 488 |
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Posted: Aug/16/2021 at 6:18am |
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Thank You. I have a converter being built for a 998 LU that is 3200 stall. The original tranny is out of an 82 spirit 258. I was told it was a 998 LU but I wanted to know just in case it was a 904 LU
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1981 Spirit
(420 cu in stroker - 570 hp) 1966 Ford Fairlane Convertible (331 Cu In - 450 HP) |
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FSJunkie wrote: