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formerly litig8r
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Discussion Starter · #1 ·
Have owned my 57 for nearly four years now. The weak point (since I got the power steering sorted) has always been the powerglide; it works ok but it is not always smooth, it leaks fluid if left for more than a couple of weeks, and of course it doesn't help with mpg; so I am thinking now is the time to bite the bullet and upgrade to a TH350 or 200/700.

The car is a stock 283 v8 and is used for cruising only, fuel economy (using the term relatively) is more important than quarter mile time!

The conversion is way beyond my capabilities and i suspect it is also beyond those of the garage I normally use for "big stuff".

Can anyone recommend a specialist who unerstands this and who can (i) advise on what 'box to go for and (ii) carry out the work? I am in the Midlands, so north of London is preferable to south, but I want it done "right", so will travel if necessary.

Cheers Tim
 

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You will need a x member too. Russ pepper will have bolt in ones with the trans mount. A gearbox / converter. Shifter although there is a kit to retain your colum change with a 350 gearbox. Shift cable. When its done you can chop off the powerglide side mounts and run your exhaust higher. I've done this swap twice but am probably too far for you.
 

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The 200R4 is the same length as a powerglide so you can retain the standard prop, you may have to change the yoke. I'd consider importing a built unit. Definitely go overdrive as it's much nicer keeping up with modern traffic without revving the nuts off it.
 

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The powerglide on a 57 will be the 'heavier than the engine' iron version. They are sluggish, leak and burp fluid when hot. Only really good for a numbers matching car. They really have no place in a modern build with so many alternatives about. A TH350 is around 28 3/4" from bell housing to tail end with a 6" tail shaft.
 

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The powerglide on a 57 will be the 'heavier than the engine' iron version. They are sluggish, leak and burp fluid when hot. Only really good for a numbers matching car. They really have no place in a modern build with so many alternatives about. A TH350 is around 28 3/4" from bell housing to tail end with a 6" tail shaft.
...Thats the one I have a propshaft for ,dont fit mine now cause engine moved forward to be able to fit hei dizzy
 

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formerly litig8r
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720 Posts
Discussion Starter · #9 ·
Thanks Russ, and thanks everyone else for the input. Thanks for the offer Dave, too early to say yet, but i will let you know!

Cheers Tim
 

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The cheapest option would be a TH350. The lower 1st gear will really wake your car up. The final drive is still 1:1 and a sensible converter will be a great improvement. Any post '63 ally glide, 350, 200, 700, 4L60 or 4 sp manual prop end will work with the box. There are cheaper linkages than the lokar version which I have used that work well too.
 
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