TH350 Clutches / Modifications

Alan Roehrich · 05-20-2011, 02:15 AM

Mark, I was thinking 6.17 gears, if it's a 12 bolt, and about 6000 stall, if he's got a Super Stock engine that will spin anything like it should. Not sure a 2.75 low will work because of the drop between 1st and 2nd. That extra point and a half of gear is a big deal to a small engine with no torque, especially in a heavy car.

Going from 2.52 in 1st to 1.52 in 2nd is not the same as going from 2.75 in 1st to 1.6 in 2nd, even though the 1st is low, the extra 0.15 gear drop makes a bigger difference than some think, because they forget the car is going SLOWER when it comes out of low gear with a 2.75 than it is with a 2.52, that amplifies the drop.

Mark Yacavone · 05-20-2011, 02:29 AM

Quote:

Originally Posted by Alan Roehrich

Mark, I was thinking 6.17 gears, if it's a 12 bolt, and about 6000 stall, if he's got a Super Stock engine that will spin anything like it should. Not sure a 2.75 low will work because of the drop between 1st and 2nd. That extra point and a half of gear is a big deal to a small engine with no torque, especially in a heavy car.

Going from 2.52 in 1st to 1.52 in 2nd is not the same as going from 2.75 in 1st to 1.6 in 2nd, even though the 1st is low, the extra 0.15 gear drop makes a bigger difference than some think, because they forget the car is going SLOWER when it comes out of low gear with a 2.75 than it is with a 2.52, that amplifies the drop.

I imagine Daran is trying to pick up the 60' with the low gear change.
If he had the right rear gear, he wouldn't need the low gear set.
We used about 5300 stall in a 283/220 SS car, about 30 years ago.
He needs a 6.40 ford or a 6.50 Dana to do it right.

Alan Roehrich · 05-20-2011, 02:33 AM

We've got a 6500 in the SS/EA car. I've got a 2.75 low in it because I can't get the 5.57 they say I need, the closest I can get is a 5.38, they don't have a 5.57 for a Dana 60. I'm not sure the RPM drop won't hurt me a little. But I need the car to move harder, and I think between the stall and the big block, I can pull that drop okay.

Daran Summerton · 05-21-2011, 09:28 AM

Just installed a light T-350 2.75 low with brake this time. On the brake the converter is going 5200. Heading to Gainesville tonight to try. Hoping for a 1.5 something??? 60 ft. I have a 12 bolt in it with 9x30 radials. Perhaps a 6.14 and a ET 29.5 will be next.

Richard Grant · 05-21-2011, 11:33 AM

You need to check on a Billy Lynn metric trans. He's a lot more reasonable on price that McClay and his stuff will work just fine in I/SA.

Daran Summerton · 05-23-2011, 08:40 AM

Well tested Sat. night and everything went well, lost in the final of the index race. Trans made car much easier to drive leaving on the mat. Unfortunately the car still only went 1.80-1.81 60 ft. The car just will not react. The front end does not move at all. I believe I am WAY under geared but I have to work on the suspension. Any front spring recommendations? Can I remove front strut rods to free up the front. I have CE 90/10 shocks on loose setting. Car just is not working.

Alan Roehrich · 05-23-2011, 10:15 AM

Quote:

Originally Posted by Daran Summerton

Well tested Sat. night and everything went well, lost in the final of the index race. Trans made car much easier to drive leaving on the mat. Unfortunately the car still only went 1.80-1.81 60 ft. The car just will not react. The front end does not move at all. I believe I am WAY under geared but I have to work on the suspension. Any front spring recommendations? Can I remove front strut rods to free up the front. I have CE 90/10 shocks on loose setting. Car just is not working.

Daran, are you shifting before the 60' clocks?

Mark Yacavone · 05-23-2011, 02:20 PM

Quote:

Originally Posted by Daran Summerton

Can I remove front strut rods to free up the front. I

NO! They are the triangulating point for the lower A-arm.
What's done to the rear susp.? If it's too stiff, the front won't lift with that long wheelbase.
I never had one of those cars that wouldn't lift the front end, with stock springs.
It sounds like the engine combo is messed up .
Need details ...Cam ,manifold, carb modifications , headers etc.

Alan Warman · 05-23-2011, 11:12 AM

Quote:

Originally Posted by richard grant

you need to check on a billy lynn metric trans. He's a lot more reasonable on price that mcclay and his stuff will work just fine in i/sa.

x2

Daran Summerton · 05-23-2011, 12:45 PM

No WAY! I think closer to the 330. I am beginning to think 28" slicks now

I will need to get a video of it to show you how pathetic it is. 2.52 vs 2.75 low made no difference, just shift sooner

05-20-2011, 02:15 AM	#1
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,113 Likes: 1,571 Liked 1,823 Times in 413 Posts	Re: TH350 Clutches / Modifications Mark, I was thinking 6.17 gears, if it's a 12 bolt, and about 6000 stall, if he's got a Super Stock engine that will spin anything like it should. Not sure a 2.75 low will work because of the drop between 1st and 2nd. That extra point and a half of gear is a big deal to a small engine with no torque, especially in a heavy car. Going from 2.52 in 1st to 1.52 in 2nd is not the same as going from 2.75 in 1st to 1.6 in 2nd, even though the 1st is low, the extra 0.15 gear drop makes a bigger difference than some think, because they forget the car is going SLOWER when it comes out of low gear with a 2.75 than it is with a 2.52, that amplifies the drop. __________________ Alan Roehrich 212A G/S

05-20-2011, 02:33 AM	#3
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,113 Likes: 1,571 Liked 1,823 Times in 413 Posts	Re: TH350 Clutches / Modifications We've got a 6500 in the SS/EA car. I've got a 2.75 low in it because I can't get the 5.57 they say I need, the closest I can get is a 5.38, they don't have a 5.57 for a Dana 60. I'm not sure the RPM drop won't hurt me a little. But I need the car to move harder, and I think between the stall and the big block, I can pull that drop okay. __________________ Alan Roehrich 212A G/S

05-21-2011, 09:28 AM	#4
Daran Summerton Senior Member Join Date: Jun 2003 Location: Las Vegas nv Posts: 600 Likes: 18 Liked 66 Times in 37 Posts	Re: TH350 Clutches / Modifications Just installed a light T-350 2.75 low with brake this time. On the brake the converter is going 5200. Heading to Gainesville tonight to try. Hoping for a 1.5 something??? 60 ft. I have a 12 bolt in it with 9x30 radials. Perhaps a 6.14 and a ET 29.5 will be next. __________________ 72 cutlass

05-21-2011, 11:33 AM	#5
Richard Grant Member Join Date: Jan 2002 Location: West Monroe, La. Posts: 301 Likes: 9 Liked 13 Times in 7 Posts	Re: TH350 Clutches / Modifications You need to check on a Billy Lynn metric trans. He's a lot more reasonable on price that McClay and his stuff will work just fine in I/SA. __________________ Richard Grant 4988 STK

05-23-2011, 08:40 AM	#6
Daran Summerton Senior Member Join Date: Jun 2003 Location: Las Vegas nv Posts: 600 Likes: 18 Liked 66 Times in 37 Posts	Re: TH350 Clutches / Modifications Well tested Sat. night and everything went well, lost in the final of the index race. Trans made car much easier to drive leaving on the mat. Unfortunately the car still only went 1.80-1.81 60 ft. The car just will not react. The front end does not move at all. I believe I am WAY under geared but I have to work on the suspension. Any front spring recommendations? Can I remove front strut rods to free up the front. I have CE 90/10 shocks on loose setting. Car just is not working. __________________ 72 cutlass

05-23-2011, 12:45 PM	#10
Daran Summerton Senior Member Join Date: Jun 2003 Location: Las Vegas nv Posts: 600 Likes: 18 Liked 66 Times in 37 Posts	Re: TH350 Clutches / Modifications No WAY! I think closer to the 330. I am beginning to think 28" slicks now I will need to get a video of it to show you how pathetic it is. 2.52 vs 2.75 low made no difference, just shift sooner __________________ 72 cutlass