Gordon Nichols posted:Of course it is one of the best things you can do for your car.
Everyone knows that.
The problem is what Stan posted: There are diminishing marginal returns going from the 4-speed to the 5-speed versus cost/value. So much so, that the vast majority of us simply cannot justify the greatly increased cost of buying/modifying the gearbox and modifying the pan/frame to accept it, not to mention the loooooong lead time just to get one (unless you find a decent 901 kicking around).
Believe me, I would like to go to a 5-speed, but for the amount of driving I do and the majority of the roads I take my car on, the 4-speed I have with a 3:88 rear is working quite well and I’ll stick with it. I lost a little acceleration “kick” going from a 4:12 to the 3:88, but it’s working out very well for me, so that’s it.
It's like any upgrade, after you done it.....you wonder why you wanted so long!
keep in mind a 901 box with the right ratios is much more expensive and a pain in the ### to fit.
think about that twisty road where you down shift and past the guy in the bmw or on the freeway and drop from fifth to fourth to motor by the guy talking on his phone...but the most fun is when you wind it out in second and shift to third and it feels like you hit hyper space! then you shift to fourth and it happens again!
I drove my daily driver to and from work 2 hours each way in a 63 bug with a 1600 with dual kadrons and stayed with the flow of traffic and passed a few along the way at 75-80mph with the berg 5. I ran more combos than you could imagine in regards to ring and pinions and first thru fifth always looking for a better combo.
I always had a simile driving that car