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904 trans with a 2.74 first gear ?
These are the part numbers from the Mopar Chassis book for A999 H.D. trans for 360( they first appeared in the 1974 360 4brl cars) All of the part# below had 2.45 first gear sets as far as I know, except the P parts trans that could have had the 2.74 gear set( I do not know for sure) 74-75 PN3681844 A999 non lock-up 76-77 4028465 A999 non lock-up 1978 4028878 A999 non lock-up 4028815 A999 lock-up 4058111 A999 lock-up 1979 4130515 A999 lock-up 4130645 A999 lock-up P parts trans/ P4130400 A999 non lock-up(with man. v.b.) PN3743382 A999 5 disc front clutch retainer, 1942403 front clutch plates(5 required) 2205203 front clutch disc(5 required) My book only goes up to 1979 so this is all the part numbers I can give for the A999 and this same book says the A998 trans came out in 1968( I thought I was told 67 I was wrong) as an H.D. trans for the new LA 318. I had 3 of A999 transmissions back when I was racing my 69 GTS Dart W2 360(3681844) that was built by Turbo Action with a low gear set. I put that one in my 80 Mirada but the new W2 372 engine and the low gear set didn't like to play nicely together, so I found another(844) in a 75 360 Cordoba( which was a standard 2.45 gear set) and put it in the Mirada. Soon after I pick up a spare A999 part # 4028465(2.45 gear set) and If I remember right it came out of a 76 Plymouth Fury 360 2brl . My trans guy told me at the time what cars with 360 engines to look for transmissions in.
Since this low gear thing has been kicked around now a bit. I'd like to know what that 1st gear ratio is and how it compares to what other brands are running at the strip.
Cool, thanks for this. I actually "learnt" me a couple of things. I didin't know the 998 and 999 ever came as a non lockup, nor did I know they were introduded that early. Thanks.
The 999 I'm going to put in my 65 Barracuda must be a 80's model. My book doesn't list it, and the number is beyond any listed here previously. I've Googled it to death, but must be wording the search wrong! It's P4295887 7966 5768. It's a lockup for sure, and I'm hoping it's the low 1st gear.
Get the convertor hub changed to your 65 small hub crankshaft or change your crank to a >67. Can adapt an early trans to fit a later motor with hub bushing but not the other way around.
904/727 ratios are 2.45-1.45-1.00; some 998s are this as well some998/all999 are 2.74-1.54-1.00 The standard ratios could be considered "close ratio" compared to the 999 ratios.
https://www.forabodiesonly.com/mopar/threads/how-to-identify-a-non-lockup- a999-transmission-with-pics.307306/ This was a post written by rmchrgr back on March 1 2015 on A999 transmissions
I have a 273 block, and if I use it....it will be with a 318 or 340 crank. I'm pretty much leaning towards building a 318 or 340 though. "Somebody" has a sig line that makes pretty good sense.....lol. Now, back to our regularly scheduled tranny discussion!
I found out it's from an 84 5th Avenue or Diplomat.