Is it possible to convert an OD trans to a standard?
#148467
11/10/08 04:47 PM
11/10/08 04:47 PM
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Joined: Feb 2005
Posts: 351
Spokane, WA
48Heap
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OP
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Joined: Feb 2005
Posts: 351
Spokane, WA
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Can you take a cast iron case OD 4 speed and swap gears to make it a 3.09 first gear standard 4 speed?
Said another way, would the 1.92 ratio second gear and 1.40 ratio third gear swap for the 1.67 ratio second gear and the 0.73 ratio third (OD) gear? I know it would require a new cluster gear, that is part of the question.
My concern is if the gears would fit on the main shaft, if the cluster would fit in the case, and if there would be any issues with the existing first and 1:1 gears meshing with the new cluster.
Is this a big no-no?
Not sure of the year of the trans, but it is a cast iron case (as I said above) with the big 727 slip yoke.
Thanks!
15 Chrysler 200S 3.6
15 Challenger R/T 6M STP
74 Duster 360 -> original 4 speed car
a.k.a. DionR
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Re: Is it possible to convert an OD trans to a standard?
[Re: 48Heap]
#148468
11/10/08 05:09 PM
11/10/08 05:09 PM
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Joined: Jan 2003
Posts: 9,982
Ansonia, CT
CJK440
master
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master
Joined: Jan 2003
Posts: 9,982
Ansonia, CT
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The OD mainshaft journals are different. Regular 4 speed gears won't fit.
Why not just find a stock 3.09 first gear 4 speed?? They are arguably the weakest A-833 and shouldn't command too much money. I beleive the OD iron case still retains the floating countershaft that people like to do away with.
2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"
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Re: Is it possible to convert an OD trans to a standar
[Re: CJK440]
#148472
11/10/08 05:33 PM
11/10/08 05:33 PM
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Joined: Jan 2003
Posts: 75,005
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,005
U.S.S.A.
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Quote:
Quote:
no you can't just swap some of the guts , you have to swap them all , the tooth counts aren't the same , also the manishft is different , it's smaller in diameter where 3rd (od in the od trans) rides .
Don't quote me but I "think" the input and the first speed gear have the same tooth counts since they are both 3.09 first gear.
It would be interesting to find out , I did try to use the input shaft from an OD trans in a NON OD trans , both 1 to 1 correct ? the tooth count was different .
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Re: Is it possible to convert an OD trans to a standar
[Re: wildman340]
#148475
11/10/08 08:42 PM
11/10/08 08:42 PM
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Anonymous
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Anonymous
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I'm not sure I'm correct, the pinion (input) shaft may be the same as the 3:xx low gear box (4 speed), as MAY be the mainshaft, but at least third gear (now used for 4th) and the cluster CANNOT be the same. (I'm speaking here of the lower geard 273 style box, which have a smaller mainshaft and 3xx low gear)
You must remember that the third gear is overdriven, and shifted (upside down shift lever) as 4th, so to spin the third gear faster as an OD gear, the mainshaft must be smaller to make the gear smaller. Thus, at least the cluster and "third" gear must be different.
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Re: Is it possible to convert an OD trans to a standar
#148476
09/10/12 07:31 PM
09/10/12 07:31 PM
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Joined: Feb 2005
Posts: 351
Spokane, WA
48Heap
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OP
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Joined: Feb 2005
Posts: 351
Spokane, WA
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I ran across an interesting article in one of the old Hot Rod magazines I snagged at the swap meet this summer, thought I would share some info. In the January 1976 issue of Hot Rod, Dick Landy does an overdrive conversion on an older A833 box, and they show what parts need to be swapped. Looks like there are 6 pieces that are different.   Probably not a big deal, but thought I would share in case someone was interested.
15 Chrysler 200S 3.6
15 Challenger R/T 6M STP
74 Duster 360 -> original 4 speed car
a.k.a. DionR
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