I6 T5 vs. V8 T5 - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

MrPlow2 · 02-18-2002, 17:16

my main question is whether you can fit a T5 from a V8 to an I6? i've heard they are different - V8 'boxes are apparently stronger.

smciner1 · 02-18-2002, 17:29

I don't know if they are any stronger but they do have different ratios.

XR_Strider_GuY · 02-18-2002, 17:30

Well i think the ratio's would be different in the V8, hence suiting what ever V8 the tranny is suppose to go into. If you use a V8 T5 while mechanically it's got all the stronge bits, the ratio wouldn't suite the 6's. Thsi is what i heard about the AU that the tranny is a stronger unit in the 200kw and 220kw motors.

In EF's the XR8 and my tranny are identical apart from ratio's. Clutch is different.

02-19-2002, 02:21

That's right DO NOT use an I6 T5 behind a V8. They are much weaker. The reason is partially to do with lower 1st gear on the six cyl boxes....it reduces the torque capacity enormously.

The best T5 to use is the Ford Racing parts Z-type T5. It has closer ratios(2.95 1st gear) and a stronger alloy gearset for 330lb/ft torque capacity. My mates 5.0 Capri has one. I think it cost him about $1050 U.S. which worked out to around $2500 aussie all up. I hear you saying "why not go for a Tremec 3550?"
It was a case of dimensions and weight.

Pete.

rally · 02-19-2002, 22:34

Quote:

Originally posted by EF_Falcon_GuY
Well i think the ratio's would be different in the V8, hence suiting what ever V8 the tranny is suppose to go into. If you use a V8 T5 while mechanically it's got all the stronge bits, the ratio wouldn't suite the 6's. Thsi is what i heard about the AU that the tranny is a stronger unit in the 200kw and 220kw motors.

In EF's the XR8 and my tranny are identical apart from ratio's. Clutch is different.

The V8 and I6 'boxes are essentially the same. The input shaft on the V8 box is about 30mm longer than the one on the I6, so you can't swap them around terribly easily. The extension housings are also a different length.

From what I can tell, they are both about the same 'strength'. The T5 was not used in any V8 application until it got a highish first gear, so in theory it had greater strength. Unfortunately on the T5s, most of the problems occur when 2nd and 3rd break.

XF-ED I6 T5 ratios: 3.5, 2.14, 1.39,1.00, 0.72
EF-EL I6 T5 ratios: 3.25, 1.99, 1.29, 1.00, 0.73
V8 T5 ratios: 2.95, 1.95, 1.34, 1.00, 0.73
tremec 3550 3.27, 1.98, 1.34, 1.00, 0.68

cheersbigears...

02-19-2002, 22:44

Actually most aussie V8 T5's (strangely enough)have the 3.35 1st gear. This is one of the reasons they are weaker.

The I6 gearboxes are only rated to about 265 lb/ft whereas the V8's are about 295lb/ft.

Pete.

HP Dude · 02-19-2002, 22:53

Don't the 8 gearboxes have stronger teeth?

I was told by a bloke who worked at Ford that the HP has the standard T5, the VCT gets tougher teeth and the XR8 has the toughest teeth. Is this accurate, or have I been told crap? Im not an expert on mechanincal issues.

HP Dude · 02-19-2002, 22:54

Quote:

Originally posted by HP Dude
Im not an expert on mechanincal issues.

See, I can't even spell the word!!

02-19-2002, 23:09

Quote:

Originally posted by HP Dude
Don't the 8 gearboxes have stronger teeth?

I was told by a bloke who worked at Ford that the HP has the standard T5, the VCT gets tougher teeth and the XR8 has the toughest teeth. Is this accurate, or have I been told crap? Im not an expert on mechanincal issues.

Yes the V8 ones have stronger teeth and better bearings but if your talking 2.95 1st vs 3.35 1st, the 2.95 wins. More likely the VCT is the same as the V8 but with a lower 1st gear that isn't as tough.

Pete.

HP Dude · 02-19-2002, 23:11

Quote:

Originally posted by XR9UTE

Yes the V8 ones have stronger teeth and better bearings but if your talking 2.95 1st vs 3.35 1st, the 2.95 wins. More likely the VCT is the same as the V8 but with a lower 1st gear that isn't as tough.

Pete.

Thanks mate! I was wondering about the VCT box.