DO ya think a turbo 400 would have to have a lot of work done??

six speed auto for the win...................

ouch why not use arrows instead of bullets
dragweek quickest street rod
2009 2010

Makes no sense to force the "Ford trans only" agenda if/when a given big torque Ford combo ends up truly being faster/quicker with a 2 speed's ratios, & slower with a 3 speed's ratios.

It might be a different story if someday someone stepped up & made a competitively priced SFI legal C-4 or C-6 case/bell housing assembly (like the SFI glide stuff), and calmer 1.76/1.80(ish) first gear ratios for the C-4 or C-6. When/if both ever happens there might be a fighting chance at stealing some the Ford guys that run fastest with the 'glide back to a Ford trans.

a roller C-6 with Frank's T-brake and 1.80 1st/1.30(ish) 2nd/1.0 3rd gear ratios might be kinda interesting, kinda like a 3 speed LencoDrive/converter setup.

Ok Dave I have a question about your glide - 3 speed comparison. If the glide is a 1.8 first ratio and rear is a 4.86(like posted in other threads as a popular rear gear choice) would this not be the same(or extremely close) as a c-6 or c-4 with a 2.46 first gear ratio and a 3.50 rear gear? You can get both the 4.86 and 3.50 in a pro series 35 spline 9 inch gear. Would these two not act almost identical or am I missing something?

1.8 x 4.86 = 8.748

2.46 x 3.50 = 8.610

Just trying to learn something here please elaborate.

Thank You

Todd

Not sure about the torque multiplication issues. Total Ratio wise the starting line will be very similar. Now you have a problem down track. unless you just leave the c6 in second gear.

dkp

^^^^^^and by doing that your eating up more power.

Yep I was thinking of that as I typed it. But hey keeps the car all ford right

btw mine has a glide. I love it.

dkp

Ok excuse my ignorance as I have only been on a dragstrip once in a stock f-150 lightning, but am working on building my mustang to race it now since i retired from mud racing, but i dont understand what problem you are refering to down track? Also how is this taking more power?

lghting94 wrote:Ok Dave I have a question about your glide - 3 speed comparison. If the glide is a 1.8 first ratio and rear is a 4.86(like posted in other threads as a popular rear gear choice) would this not be the same(or extremely close) as a c-6 or c-4 with a 2.46 first gear ratio and a 3.50 rear gear? You can get both the 4.86 and 3.50 in a pro series 35 spline 9 inch gear. Would these two not act almost identical or am I missing something?

1.8 x 4.86 = 8.748

2.46 x 3.50 = 8.610

Just trying to learn something here please elaborate.

Thank You

Todd

If you're comparing only the "overall" first gear ratios between a 2 speed and a 3 speed auto then yes, you can achieve at/around the same overall working first gear ratio between the 2 speed/3 speed trans by adjusting/changing the rear gear ratio.

But in doing so you also have to look at what that will do to the engine vs power band down track once you're in high gear. Sure the overall first gear ratio (and launch energy/violence/hit) between the two trans are now at/close to being the same. But once you pull high gear what effect will a big tire car see with the glide/4.86 combo vs the 3 speed/3.50 gear combo.

If the 3 speed/3.50 gear combo calms down a violent launch (like the glide/4.86), but then happens to lugg the motor down in high gear because of the 3.50 gear, nothing positive is accomplished.

Now it might be a different story in this comparison if the 3 speed/3.50 combo is never shifted into high gear, But using the 3 speed's overall working 2nd gear ratio as if it was a 1 to 1 "high gear" might be a little too much (1.46 (IIRC) x 3.50 = 5.11).

In a 3 speed gearing to run the 1st and 2nd gear only.............in 2nd your turning a planet, dragging the high gear clutch pack somewhat..................in high gear ................1-1.............its all locked together........= less power to turn the deal.

Tranny is using less power to turn it in high gear...be it a C4, C6, T400, pg etc.

OK thank you that does make more sense now. My thought was that by doing the 3-speed with the higher rear ratio you would shift to second about the same time as with the 2-speed and the to third probably close to the 1/8th mile mark maybe a bit sooner. The other reason Was that way if you want to run the 1/4 mile the gears wouldnt need changed causing the car to react differently off the line.

Well all I can say is Frank M. has his C6 combination working pretty Dam Good and with big hp & tq... C6 fer me guys, behind my 611ci.

res0rli9 wrote:Well all I can say is Frank M. has his C6 combination working pretty Dam Good and with big hp & tq... C6 fer me guys, behind my 611ci.

No argument that Frank has a C-6 combo that can handle the big power numbers. But he has also mentioned in the past that the car sometimes black-tracks most of the pass. That raises the question, is this slight wheel "over-speed" (not a flat-out "spin", but not just minimal slippage either) initially caused from the C-6's increased 1st gear ratio leverage, or from track prep/summer heat, or possibly from the combo needing a little more slick OD and/or more sidewall?

There is so many different things that can effect a given combo.

Looking at it from the "street/highway use" side, I guess a C-6 in a street driven car could be used somewhat like a poor-mans overdrive if the C-6 gets the steeper E4OD planets installed, and gets less rear gear for somemore highway speed.

stock C-6 overall 1st w/3.50 rear gear:.................. 2.46 x 3.50 = 8.61

stock C-6 overall 2nd w/3.50 rear gear:................. 1.46 x 3.50 = 5.11



OD gear set C-6 overall 1st w/3.25 rear gear:..........2.71 x 3.25 = 8.8075

OD gear set C-6 overall 2nd w/3.25 rear gear:.........1.54 x 3.25 = 5.005



OD gear set C-6 overall 1st w/3.00 rear gear:..........2.71 x 3.00 = 8.13

OD gear set C-6 overall 2nd w/3.00 rear gear:.........1.54 x 3.00 = 4.62

In my mud truck I used the c-6 with the 4r-100 planetarys(same as e40d but 6 pinion) and did this to allow a bigger split between gears as well as a harder launch with more wheel speed on the top end granted I was in 4-wheel low range on 125 ft track, but i only used 1st and second gear 90 percent of the time this combo worked best with a 3.50 rear gear the way my truck was set-up with leaf springs