so if it’s worn out to much do I need a new gearbox, I wouldn’t rebuild this one , it’s a standard t56, I don’t know how it’s lived this long.
if I need new gearbox I wonder if I can get a 8 or 10 speed auto to work.. if I can get a ecu and controller that’ll work with my engine I wouldn’t worry about losing traction control , stability control etc etc

 

Unless pilot bearing is worn and not spinning, I don’t see how it can wear the input shaft.
Same for bronze pilot bushing, being softer, it would wear out instead of input shaft.

My guess is that with .010 of wear at the input shaft, there would be a visible ridge at the shaft surface that’s in contact with pilot bearing/bushing.

 

Yes there is a visable ridge on the input shaft. I have a C6 Corvette so sort of a stub shaft that is bolted to a coupler. I have a torque tube and my transmission is in the rear. I have a steel roller pilot bearing I am going to check it tomorrow and I bought a new one.

 

I ended up putting a new mantic twin plate ceramic clutch in. The old one went thru 3 sets of clutch discs without changing the intermediate plates so I had a good run from it.
So I replaced the clutch went for a 40 minute drive and about 2 minutes from home I started getting a miss, found a plug lead had popped off. Put it back on and went for a drive and when it went closed loop I started getting a miss. Got back home and pulled a plug on each bank, the drivers side, your passenger side had a bit of carbon, other side looked like new, I only just put in a new set of tr6s in and new o2 sensors in.
So I’m thinking it’s o2 related and swap o2s over, go for a drive and as soon as it goes closed loop I get the miss.
Get home put old o2s in , same thing, whengoes closed loop I got the miss..
Get home pull a plug on each bank , oneside carbon other side like new.
iI haven’t got my pc at home so I can’t check on hp tuners...
Any Ideas????

 

Mick, start with scanner to save yourself time and unnecessary expense of assuming and replacing parts for nothing.
Scanner would really help here to monitor and isolate misfire to speed up diagnostic. Check misfire data and fuel trims. You can also watch injector pulse width at the moment when system goes in closed loop.
If entire bank becomes rich after swapping O2 sensors from one bank to another and misfire did not follow O2 sensor, I’d check for exhaust leaks that could cause extra oxygen pulled in from outside causing false lean condition. Once in closed loop, pcm would start to compensate by injecting more fuel causing real rich condition. BUT this usually doesn’t cause misfire, misfire would already be there to cause pcm to take action.

If is always present, but not detectable in open loop, it may only be felt when pcm starts to compensate. Scanner would really help here.
Could be bad ignition wire(s) / weak coil that doesn’t fire under load or when mixture is lean.
-Bad injector can cause it too.
-Issues like bad ground, injector wiring, ignition wiring, O2 wiring.
-Compression test could detect mechanical problem if all the above checks out.

 

Its definitely not a mechanical , spark plug lead issue..
exhaust doesnthave leaks.
im betting on its the o2 sensor extension.. I’ll have pc back today so will run a scan tomorrow

 

Ended up being the o2 extension.... was my fault, got the extension between engine and bell housing when I put gearbox back in. I thought I had it out of the way but I can’t see nor get my hand up to feel if it was.
All good now

 

I like guys like you who are willing to post up their mistakes.

 

Only way for the community to learn.
I’m glad it was a simple fix

 

What do you all think about after market coils, think there worth it?
Also anyone running adjustable yella terra rockers , what valve covers are u running?
finally I’m chasing a 54 Chevy pickup , something I can do up with my youngest boy, the cheapest one I can find in aus is $28,000au/$21000us
whats the consensus on spark plug leads, which do you think are best at hanging on to the spark plug after being taken on n off countless times?
after putting new o2 sensors on I’ve had to go back and street tune again, also swapped a few spark plug leads to old msd ones I had..she’s purring now

 

Aftermarket coils - if you mean spark, the ign1a are good. But a hassle due to size. If you mean coil springs, that's a whole topic.

Adjustable YT - I use the Holley cast tall covers. You still need that thick spacer gasket. The sniper covers have more room but they're a pain in the *** to get the bolts started.

Plug wires. My firecore have held up good. The other brands I've heard are really great are Scott Performance and Taylor.

 

Dart did you have to remove the baffles in the holley tall covers.
I originally bought them along with the taller gaskets and the rockers were hitting

 

Scott (Che70velle) is running Katech valve covers with Yella Terra rockers.

 

The IGN1a coils are supposed to pick up a little power ~5whp or so.

Firecore makes a great wire and can even make custom length with custom boots. Taylor also makes a good option.

 

I had yella Terra on my ls3 heads. No issue with rocker arms but fought valve cover clearance issues.
now have crower on mast black label ls7 heads and use proform valve covers with tons of room. I believe they would work on yella terra also.

 

Thanx for the feed back all
Now i have a new problem, did some minor tune adjustments the other day and was running great, started up the next day and shes getting a miss here n there up to 2000rpm then itd go well, did a log and all of a sudden im running heaps lean. Somethings commanding afr 14, 15, 16:1
im thinking the new o2s hv **** themselves, if not that one of the other sensors. The o2s just keep going up and down , one up , one down then they swap and keep on going tht way

 

Are your header collectors leaking? They can siphon air into the header and make the O2 sensor read lean. It will be worst at idle and low throttle.

 

[QUOTE=Kawboom;20421743]Are your header collectors leaking? They can siphon air into the header and make the O2 sensor read lean. It will be worst at idle and low throttle.[/QUOTi
cant here anything unusual but ill get under the car tonight and have a good look. I dont think its likely tho due to both banks having the same reading
Put new spark plugs n leads in yesterday
Should the ambient air temp in my tune have a reading at all times??

 

If its both banks at the same time I would probably bet on your side.

 

I cleaned entire fuel system last night just in case it was the issue I’m having with it running lean. Wasn’t much to see there. This mornin I took it for a drive , no change.
So I fell back on what I always do when it’s running rough, put new o2s in, only put new ones in a couple of weeks ago.
They did the trick.. runnin sweet once again
I also tried getting the Holley tall valve covers to fit. Took the baffles out, screwed them on , no problems