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What tranny comes standard in 74 Gremlin 258?

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Gizmo456 View Drop Down
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    Posted: Aug/25/2016 at 11:43pm
Hi guys/gals,


I'm looking to find out what transmission came standard in a 1974 Gremlin X 258 I6? I know that they switched from a Borg-Warner 72 and up to a Chrysler TFT. My question is, do I have the TFT 904 or TFT 727 in my car?


Thanks for looking 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote 74gremx Quote  Post ReplyReply Direct Link To This Post Posted: Aug/26/2016 at 2:48am
904 I reckon. 727's were in the big cars. I have a 904 behind my 304.
1970 Javelin 360/727
1974 Levis Gremlin X 304/904
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 401harry Quote  Post ReplyReply Direct Link To This Post Posted: Aug/26/2016 at 5:24am
Probably a 998 in back of the 304. 727s were an option on certain models with 6 cylinders
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farna View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Aug/26/2016 at 6:28am
The 998 or 727 was a fleet option behind the six. Typically only taxis and similar cars that were used hard and didn't survive. I've never actually seen a 727 behind a six in any car from the factory. Would be a waste of power IMHO, even in a taxi -- not much benefit at all. Just put a HD cooler on the 904, and maybe firm up the shift... or use the 998. Typically AMC used the next larger trans for the HD option -- in this case the 998 would be the HD option for the six, the 727 HD option for the 304. Bigger motors got the 727 and would just have an external cooler added for the HD option (in conjunction with the radiator mounted cooler).
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Gizmo456 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gizmo456 Quote  Post ReplyReply Direct Link To This Post Posted: Aug/26/2016 at 9:30am
Nice. Thanks guys. I'm going to be putting a procharged 401 much like member Shootist's Javelin and using the bulltear I6 to V8 motor mount plates. So I'm going to need a tough tranny.

How do I tell what tranny I have then? Are they stamped or do they have any distinguishing features between them?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 401harry Quote  Post ReplyReply Direct Link To This Post Posted: Aug/26/2016 at 2:22pm
The 904 and 998 are identical except the 998 case has 2 reinforcing ribs above the servo. The 727 is physically larger and has a different pan with a kick out for the servo as opposed to the rectangular 904/998 pan. I am using a beefed 998 behind a 401 in my Spirit but with a procharger you may want to go with a 727 depending on output level. A good properly modified 998 can hold 500 HP in a light car
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gizmo456 Quote  Post ReplyReply Direct Link To This Post Posted: Aug/26/2016 at 9:35pm
Thanks for your advice 401harry. I'm leaning towards finding a 727 for my application (800HP). I"m also curious as to whether the I6 cross member will accept a 401 with a 8 quart oil pan (milodon or canton) as well as the 727 tranny?

Should I be looking for a V8 cross member? A member here has one for sale currently...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote LakesideRamblin Quote  Post ReplyReply Direct Link To This Post Posted: Aug/26/2016 at 11:09pm
It is my understanding that the 6 or 8 cylinder crossmembers are the same in strength but obviously different for the mounts. I know the jigs with the Bulltear mounts help to line up the mounting bolts in a precise fashion. I bought a pair of Bulltear mounts and they are very high quality - cost about $290 versus the V8 crossmember for sale here for $350. My engine is a 360. Remember that with the V8 crossmember you still need the mounts. Originality is also a factor for many. If that causes you concern go with the V8 crossmember.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gizmo456 Quote  Post ReplyReply Direct Link To This Post Posted: Aug/26/2016 at 11:15pm
Nope, no concern for originality here. After all, I'm planning on back halving/tub and caging my Gremlin along with putting a procharged 401 in it. I just wanted to make sure the V8 crossmember wasn't a beefier version or reinforced as that would be a big benefit for my build.

I was however looking at the control freak upper and lower control arms and coilover setup. Very nice piece.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Aug/27/2016 at 7:38am
The six and V-8 crossmembers are identical in shape and placement, so the oil pan shouldn't be an issue. The difference is in the shape and location of the "perches" that the motor mounts bolt to.

The 998 is similar to the 904, the external difference has been noted. Internally there is a lot of difference. For one the main pump is larger, I believe it uses a 727 pump. Many of the internal parts look the same, but they are made of stronger material. The 998 was designed to be a stronger version of the 904. The external reinforcing ribs ate the servo are there because there is more pressure on the servo housing.


Edited by farna - Aug/27/2016 at 7:42am
Frank Swygert
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