glide opinions
Glides are great, but until you get to a certain power to weight ratio you won't overcome the 1st gear loss.
Now most likely your car will go fastest with a TH400, down the road if you make more power it'll go faster with a glide.
It all comes down to money, if you plan to go faster than you are now, I'd just buy the glide and live with a little slower 60ft for now.
If you're rich buy a bad *** TH400 now and then buy another bad *** glide later

Then you can give me the TH400 next x-mas
There's a lot of little things needed to make the swap so if you do it, be sure to do a write up on the journey (do's and don'ts or lessons learned)
G/L
327 chevy with TR3550 tremec 5 speed 5.14 gears: 12.97 @ 109 mph
327 chevy with glide 5500 stall 4.11 gears 12.88 at 103 mph (same engine as above)
350 Chevy with same cam and heads as previous 327:
TH350 2800 stall 4.11 gears 12.82 at 104mph
Th350 2800 stall 3.50 gears 13.10
Powerglide with 3400 stall and 3.50 gears 13.3? at 103 mph
Tremec 5 speed 4.56 gears 12.80 at 106 mph
As you can see, the glide can run the as the th350 in a milder car, but gear and converter selection is extremely important. I would rather drive the 3 speed with higher gears on the street than the 5500 stall 4.11 geared glide myself. with milder converter the glide only seemed about 2 tenths slower. But the glide kills at consitent ets.
I will be going back to the glide with 3800 stall and 3.70s when I swap in my new 489 inch aluminum head solid roller big block. I am sure it will turn the glide with few complaints. I may even back off the converter some more. I can live with the 0.2 sec difference in et in the name of consistency for my mild bracket racer!
Raceweight is 3250, running ATI Glide 1.76 gear with an ATI Converter 4500 stall. I shift at 6900 6950, the RPM drop goes down to 5200-5250.
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