RE: 3-speed manual gear ratios

[Ray Bell <raybell@xxxxxxxxxxxxxxxxx>]

Nobody got anything helpful on this?





Ray Bell wrote:
> 
> I've posted this on Moparchat as well... 
> 
> Basically, I am trying to get a full rundown of all the ratios available 
> 
> in all the 3-speed manual transmissions installed in Chrysler cars and 
> light trucks from about 1961 to 1975.
> 
> The transmissions involved are as follows:
> 
> A903 - Used principally behind slant sixes, some small V8s
> A745 - Similar to A903, but heavier gears, used behind all V8s
> A230 - All-synchro unit introduced about 1971
> A250 - Light truck unit of approximately the same era
> 
> I know there was also a Borg Warner 3-speed used, the T87 (or was that 
> T85?) as fitted to Max Wedges etc... this is outside the area of my 
> interest.
> 
> Most of what I know about these I've gleaned from websites, in 
> particular the Autohobbydigest site which no longer has quite the same 
> detail on it. The information there was, however, as incomplete as most 
> others.
> 
> I'm looking to record all the different ratios (and possibly tooth 
> counts) for each of the various trannies.
> 
> The A903, for instance, I read came with at least three set of gears. 
> For the slant 6 there was 2.95 1st; 1.83 2nd and 1.0:1 top as well as 
> another gearset with 3.22 1st; 1.84 2nd and 1.0:1 top. However, for the 
> 318 'light duty V8' model there was a very close ratioed set with a 
> 2.12:1 first gear... second was about 1.4:1, but I don't have a record 
> of that exactly.
> 
> The A745 car with something in the order of 3.09:1 first gear for the 
> most part, but big block cars (supposedly) had a 2.55:1 first and 1.49:1 
> 
> second. There was possibly yet another option with a slightly lower 
> first, but again I don't know.
> 
> The A250 is a bit of a mystery to me, but the A230 is of plenty of 
> interest. It's a similar build to the A833 4-speed and has some 
> interchangeable parts, while I know there was a couple of gearsets with 
> first gear just over and just under 3.0:1, I've also read somewhere that 
> 
> there was another with a 2.25:1 first. Yet another list shows the same 
> 2.55:1 first as came in the A745 as an option, so it's possible this has 
> 
> caused someone to get a bit excited and get the numbers wrong.
> 
> I'd like to sort all of this out if it's possible. Information will come 
> 
> from spec sheets for different models, including light trucks, and 
> possibly workshop manuals, all of which are unavailable to me.
> 
> For those not familiar with these trannies, the A903 and A745 are 'top 
> loader' type units, with a pressed steel cover over the top of the cast 
> main housing. The A745 is distinguished by having a distinctive lump 
> over in the front part of this cover over the 2nd/3rd selector 
> mechanism.
> 
> As mentioned, the A230 and the A250 look rather like the A833 4-speed, 
> but not as bulky. There is a side plate rather than a top cover, with 
> the selector levers operating through this side plate.
> 
> Those built for cars have two lengths, approximately 33" from the tip of 
> 
> the input shaft to the rear seal for the A-body units and about 4½" 
> longer for B, C and E-body trannies. There is another length in the 
> A745s that I know about, for those fitted to Chrysler models in the 
> early to mid-sixties, which have a slightly longer input shaft that 
> probably adds about 2" and is easily distinguished by having an increase 
> 
> in input shaft diameter just behind the clutch spline area.
> 
> I'm trying to get a comprehensive picture of all of these variations for 
> 
> the simple reason that it's so hard for anyone looking (as I have done) 
> to find them in any one place.
> 
> Hope you guys can help... thanks in advance.
> 
> 
> Ray 
> 
> The stories of youth, of the burden of time, and the death of 
> devotion.HCK



The stories of youth, of the burden of time, and the death of 
devotion.HCK


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