5 speed in a 4 speed box?

[DBurton]

Hi, I currently have a 69 911t with a 5 speed 69 's' box in, the original box would have been a four speed 901/06, if I found a correct case that would close match my serial number and type would the internals fit from my 5 speed or are they totally different internally? Many thanks for your help!

[Matt Monson]

Yep, no difference in cases.

[RichardNew]

4-speeds are truly rare. Mine is in a '73 and carries a 915/40 designation.

Richard Newton

[Walt Fricke]

Is the market really so nuts that a "close to matching numbers" gear box adds value? Certainly no one buying a car to drive would prefer 4 to 5 speeds, would they?

Besides, while the ring and pinion and the 1st gear are the same for the 5 and 4 speeds of that era, the other gears aren't (and while you can put 5th in the 4th gear position, the 5ths aren't the same as the 4th in a 4 speed), so you are going to have to hunt up the innards of a 4 speed, or source used gears (or new replicas) from Mr. Monson or Carquip G-Box or some other seller of gears. But maybe whole 4 speed boxes from that era are scarcer than hen's teeth?

[Matt Monson]

Originally Posted by Walt Fricke

Is the market really so nuts that a "close to matching numbers" gear box adds value? Certainly no one buying a car to drive would prefer 4 to 5 speeds, would they?

Besides, while the ring and pinion and the 1st gear are the same for the 5 and 4 speeds of that era, the other gears aren't (and while you can put 5th in the 4th gear position, the 5ths aren't the same as the 4th in a 4 speed), so you are going to have to hunt up the innards of a 4 speed, or source used gears (or new replicas) from Mr. Monson or Carquip G-Box or some other seller of gears. But maybe whole 4 speed boxes from that era are scarcer than hen's teeth?

4spd uses A,H,Q,X which aren't terribly rare ratios, however I read his post so say he just wants the right case and will move all the 5spd stuff over. If it were me, I would't bother unless it was the actual right serial number case. Like you say, it likely has nil effect on value.

As an aside, a member here today told me that Stan at Gbox has closed up shop. You might want to ring him and see if he's still in business before sending referrals there.

[DBurton]

Hi, thanks for the feed back, the reason for swapping case is due to a crack in the mag, I may just tig it up but contemplated the different casing for ease and slight more originality with numbers , thanks!