914/6 tranny or 914/4?

[914/6gt]

Have both for 6 conversion, just wondering which would be best. 2.2 S. Will different gearing make a big difference?

Thanks
Michael

[Bleyseng]

Use the six box as the high reving six will benefit from the gearing. 4 boxes have long gears as the 4 engines are low reving compared to the 6's. The six engines need the higher revs at cruise too to keep cool!

[one914racer]

the sideshift tranny is the better sifting one,the only difference from -4 to -6 is 2nd and 5th gear,2nd gear is longer in-6 and 5th gear is shorter in-6

[Dave at Pelican Parts]

2nd, 3rd, and 5th are different. 1st and 4th are the same, IIRC.

http://members.rennlist.com/chuxter/901&915ratios.htm

--DD

[Bleyseng]

Originally posted by one914racer
the sideshift tranny is the better sifting one,the only difference from -4 to -6 is 2nd and 5th gear,2nd gear is longer in-6 and 5th gear is shorter in-6

It all depends on the bushings as I have driven 914/6's with good bushings and they shifter great vs a 914 4 with a sideshifter.

All the tailshifters I have driven were very hard to locate gears.

[morgan_harwell]

>Use the six box as the high reving six will benefit from the gearing. 4 boxes have long gears as the 4 engines are low reving compared to the 6's. The six engines need the higher revs at cruise too to keep cool!

I use a 4-box sideshifter in my '73 914-6conv, the car's original transmission & gear ratios.
The Six engine has never overheated on long hi-way trips.
San Jose -> Reno-> & back summer trips(over Donner Summit).
San Jose -> Redding -> & back summer trips.

[Joe Bob]

Finding a real /6 box will be a chore....also pricey. You can regar a /4 to suit your needs.

[larrym]

i threw away my oem six trans 10 yrs ago (well actually I sold it to Gordon Luy 6 yrs after i took it out of my sixer); you only needed the oem gears if you had that underpowered oem six; a newer torquey six obviates the difference

the tiny vertical shifter lever in the oem tailshifter is prone to breaking (done that 3 times in inconvenient places)

do a sideshifter conversion; Dave at GPR used to make up the rear shiftrods & I have one of his in my car

another advantage is if you race the thing & break a trans, sideshifters are relatively easy to find as replacements (yup - done that too & have one more spare in the shed)

[RSBob]

I am going to use this with my 901 box in the 914 2.0 tail shifter. Seine Systems

Hopefully it will be a cost effective solution to a tail shifter and provide nice clean accurate shifts.

I have the Seine shift kit for my 915 box and really like the way it was built and the precise action. If their quality matches for the 901, I know I will not be disappointed.

[larrym]

oh, oh - when y'all say "tailshifter" do you have a genuine SIXer tailshifter or a 4 cyl tailshifter - they are DIFFERENT

as far as speed differences go, I calculated that the Sixer gear would only net me 5mph on a long straight at most race tracks; not worth the trouble; spend your money on brakes and cams instead

[Joe Sharp]

Pay attention to one914racer as he has done conversions to the tranny's. He has the ability to turn a T4 tranny to a -6.
Joe