Well... first of all, the factory transmissions are not mere bolt in. They will require adaptation just like the rest of what is available aftermarket. The given is... most of the aftermarket available transmissions are alreadt set-up to make things easier.
The D&D, RPM and Rockland Standard transmissions have a few things that are considered a good thing when looking at it from an internal perspective. They all come with a steel 3/4 shift fork and the majority of them have upgraded synchros and a multitude of other available options that a used, stock, transmission will not already have. Not to forget to mention that they will already have new bearings, energizer springs, dogs and seals.
Is it worth it ?? I'll say yes. You dont exactly know what you have when you drop in a used Mustang or Viper trans. At first look... I would be interested in why the transmission is for sale. Was it abused ?? Was it in a wreck ?? How many miles are on it ?? Is there a warranty ?? What if it doesnt work when you go to drive it for the first time ?? Will the seller work with you to get the issues resolved ??
And lets not forget that the D&D, RPM and RSG transmissions are set up for performance use right out of the box. You can not say that for a stocker.
I guess you really have to ask yourself what you really want. Do you want 5 or 6 gears ?? What is your rear end ratio ?? How will you be driving it ?? And ultimately... do you want something right off the palet that will work without question or do you have the time and funds to go through the used unit and fix any issue that exsist if it doesnt work as it should ?? Basically... is it worth any headache to to save a couple of bucks ??
Figuring out if you want a 5 or 6 speed is, I think, a harder decision. I have created a ratio calculator if it would be any help to you. Just PM me your e-mail and I will forward you a copy (excel format).
But if I can impression you with anything... it would be to continue to do your homework... just like you are doing and really educate yourself before you spend your hard earned money on something that doesnt suit your ultimate needs.
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