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CC Advertisers
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 6Likes
09-27-2014, 06:43 AM
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CC Member
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Join Date: Jul 2009
Location: Westerly,
RI
Cobra Make, Engine: Fordstroker 408w custom solid roller-Craft ported Brodix 17*heads-CFM ported Vic Jr. intake-1 3/4 primaries- 575hp-TKO-600RR Liberty upgrade- -Moser 8.8 trutrac-McLeod Street Extreme--QA-1-Wilwood brakes, Classic Chambered 3" Cobrapacks, Avon's
Posts: 645
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Not Ranked
I've been on the Ford websites a lot over the years and those guys Hamer the crap out of those transmissions, faceplated and all and i never heard of breaking third gear. Ive seen a lot of carnage in my years of drag racing, could this isolated incident just be a bad third gear from a metallurgy standpoint. I mean this stuff happens. I don't doubt that the .140 is an issue but does it directly result in a breakage problem the we all know about? Im not seeing that.
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Lou
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09-27-2014, 07:04 AM
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CC Member
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Join Date: Jul 2009
Location: Westerly,
RI
Cobra Make, Engine: Fordstroker 408w custom solid roller-Craft ported Brodix 17*heads-CFM ported Vic Jr. intake-1 3/4 primaries- 575hp-TKO-600RR Liberty upgrade- -Moser 8.8 trutrac-McLeod Street Extreme--QA-1-Wilwood brakes, Classic Chambered 3" Cobrapacks, Avon's
Posts: 645
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Not Ranked
Tko 600RR steeda tri ax with a nice steeda shifter, in the rear position. 3.27 rear im on the fence about switching to 3.55. Trans has notchy shifting but does get better. After 500 miles it showed improvement. Without some work its not the best powershifting trans. I have a cable set up and i found out through experience when i slightly pre loaded the throughout bearing i had a big improvement in power shifting and speed shifting. Thats cable mind you.
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Lou
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09-27-2014, 01:18 PM
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CC Member
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Join Date: Jun 2005
Location: Belleville, 15 miles East of St Louis MO,
IL
Cobra Make, Engine: Classic 427, I purchased it May 2005, the kit was bought in 1991. I'm not sure when it was completed! Installed GMPP Connect & Cruise 376/525 with T-56 S/M 3.55 gears about 2 years ago! 1/4 miles is with old setup!
Posts: 281
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Not Ranked
Quote:
Originally Posted by RET_COP
Tko 600RR steeda tri ax with a nice steeda shifter, in the rear position. 3.27 rear im on the fence about switching to 3.55. Trans has notchy shifting but does get better. After 500 miles it showed improvement. Without some work its not the best powershifting trans. I have a cable set up and i found out through experience when i slightly pre loaded the throughout bearing i had a big improvement in power shifting and speed shifting. Thats cable mind you.
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What shifter position; rear-center-front?
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Al
I want to do right, Just not right NOW!
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10-08-2014, 03:44 PM
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CC Member
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Join Date: Feb 2006
Location: Gilroy,
CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,741
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Not Ranked
Quote:
Originally Posted by RET_COP
I've been on the Ford websites a lot over the years and those guys Hamer the crap out of those transmissions, faceplated and all and i never heard of breaking third gear. Ive seen a lot of carnage in my years of drag racing, could this isolated incident just be a bad third gear from a metallurgy standpoint. I mean this stuff happens. I don't doubt that the .140 is an issue but does it directly result in a breakage problem the we all know about? Im not seeing that.
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The torque capacity for a gear set is a function of the steel used, the gear centers, the tooth style and also the face width of the gear teeth. The T56 Magnum has the same gear centers as a regular T56. The box's strength comes from increased tooth face contact (width), improves materials and also tooth pitch angle.
If you have a gear that is 1" wide and you make no changes other than reducing the tooth contact (face width) by 50% the torque capacity of the gear has been reduced by 50%. This is exactly (other than the percentage) what has happened to third gear in the TKO 600's. The torque capacity reduction is linear with gear tooth face width reduction.
Ed
__________________
Help them do what they would have done if they had known what they could do.
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10-09-2014, 04:13 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
Quote:
Originally Posted by RET_COP
I've been on the Ford websites a lot over the years and those guys Hamer the crap out of those transmissions, faceplated and all and i never heard of breaking third gear. Ive seen a lot of carnage in my years of drag racing, could this isolated incident just be a bad third gear from a metallurgy standpoint. I mean this stuff happens. I don't doubt that the .140 is an issue but does it directly result in a breakage problem the we all know about? Im not seeing that.
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Agreed....
I've moved a lot of TKO's and my supplier has moved probably 100x that....neither one of us have ever heard of or seen this failure before.
You can not preach this as gospel, when it's the only incident that has ever been shown. |
10-09-2014, 06:21 AM
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CC Member
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Join Date: Aug 2002
Location: Richmond,
VA
Cobra Make, Engine: Superformance Mk III / Windsor platform
Posts: 450
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Not Ranked
I have had 3 TKOs in my SPF replica and logged over 50,000 miles on them. Road racing, drag racing and spirited street driving. The last 40,000+ miles have been behind a very stout running Roush 427R. I have yet to trash a gear. With all do respect, I think the 3rd gear failure fear is BS. I do think that the TKO 600 is very difficult to shift quickly and reliably at high rpm. Brent has mentioned mods that will help this. I am sure there are numerous folks that can do these mods. I can say for sure that these people do good work and that their upgrade makes the TKO 600 shift much smoother and very reliably at 6200+ rpm. WELCOME TO LIBERTYS HIGH PERFORMANCE |
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