toploader interchange

[70shortbox]

Changing out the RAT-G2 3 speed for a 4 speed. What to look for in wide ratio small input transmissions? Bearing retainer size, overall legnth, and spline count.
Is there a particular extension housing that suits the shifter in a bench seat bump better than others?

 

[70shortbox]

Someone must know this?

 

[wizzard351]

a regular small input toploader out of like a 69 stang or torino type can be adapted to fit . you might have to be creative with the shifter and drive shafts might have the be made to fit but it can be done. I don't think there is a direct bolt in toploader swap. ive done a few back 20 years ago and remember making a shift leaver

 

[Alvin in AZ]

Changing out the ... 3 speed for a 4 speed.

What to look for in wide ratio small input transmissions?
Bearing retainer size, overall length, and spline count.
Is there a particular extension housing that suits the shifter in a bench seat
bump better than others?

----------------------------------------------------
Gear ratios...
1st 2nd 3rd 4th 5th -R-
T18 ========== 6.32 3.09 1.69 1.00 === r7.44
ZF M5OD-HD ===. 5.72 2.94 1.61 1.00 0.76 r5.24
Mazda M5OD-R2 = 3.91 2.24 1.49 1.00 0.80 r3.39
NP435 ======== 6.69 3.34 1.74 1.00 === r8.26
T19 = http://www.novak-adapt.com/images/graphics/t19_specs_gasket.gif

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It depends a lot on what engine you got.

Off hand I'd go with a T18 or NP435 those came in the Bumps.

^ my parts truck V

Alvin in AZ
'75 360FE +T18 bought it new, swapping the clutch out now.