H55F 5speed rebuild, LONG spline cog is it any good is not?

Hi Pop

Thanks for your input, at least I know they have been around for a while and that they maybe a good fix.

Still seems strange how there does not seem to be a lot of info regarding the longer spline cog if it is such an issue with the H55f

Regards
Geoff 17

I'm not sure the wear could be termed as such an issue. Like most things when they start to wear the process speeds up as the wear gets worse. Going back a bit but from memory the mate's had done something like 250,000 or more and even then it was driving and probably would have gone a fair bit longer but the backlash was a bit of a concern.
I guess the options you have are to give it a go or replace the mainshaft and drive gear with standard bits again and from memory they were poisonously expensive. Even an aftermarket one.
You didn't say how old and how many k's you Cruiser was.
I guess the other consideration is whether you plan on keeping it much longer.

Cheers
Pop

As Pop said keep the nut tight once sorted. when loose this is also a reason that oil passes between transmission and transfer cases, apart from worn seal and flattened "O" rings on the idler shaft.
Don Kyatt may be worth a try for the long spline gear.
Cheers

Hi Pop + Terry

I hear what your saying re the std cog doing a reasonable job anyhow, and like you say if its good for 250k well that would do I am sure.
Also I think to myself if the modified gears are bit less in quality than the Toyota as most would agree applies to other after market gearbox parts, then the long spline cog may help the spline but also may wear teeth sooner in any case????
The box was rebuilt only 150k ago in town, and I know should be fine. But 50% time its towing heavy load (only in 4th).
The job started with box starting to leak in TC and so was going to just do that on vehicle but looks like odd oil drip from bell housing so thinking rear main or front box seal.
I didn't want to do the lot due to cost and time, but if only do TC and then soon have to do rest then I have wasted time / effort.
not sure who to take it too and have been gathering info from forums how to do and have FSM Toyota but still bit scared. But also have had SOOOOOO many stuff ups in town at least I know what's been done.
when it was last built - still have receipts - they put new main rear shaft Toyota in, but NOT the offending cog, not sure why as back then I was more trusting and just dropped it off and expected a good job at the boss was ex Toyota workshop manager and does know lots, but they cannot control workers all the time.
how ever the box has / is going well apart from oil to TC, but it also is becoming a bit noisy under load in 4th, but maybe I am just listening too hard.
in 2 minds if better to do now and maybe mostly just bearings or do another 100k and then full job? but then still got the issue of rear main or front seal.
last time box was done, they had to pull out 2nd time as syncro on 2nd or 3rd from memory completely stopped after about 1 week, when they pulled apart they said had small bit of plastic stuck in syncro, and they admitted it had also happened on the last box they did also, but they didn't seem to know where it could come from which seemed odd to me as there would be few possibilities, but now going over all the part # they have listed in invoice back then they are all correct except the plastic bit under the gear stick which they part # they have is only listed for hilux and 75 series etc. so I wonder if that was cause of plastic bit?

Regards
Geoff 17

Hi Terry

Its interesting both you and Pop mention keeping the nut tight. I havnt come across this in my google searching as yet.

When you say flattened O-rings on the idler shaft, this is the TC idler I take it?

I have got a double lip seal for the job which is supposed to be better.

Also I am considering changing the TC breather to a hose to a small filter in the engine bay as I have read that it plays a role in the seal failing as there is a small spring in the breather which means when the TC oil 1st heats every drive there becomes a small pressure build up in the TC to dislodge the breather which the pressure applies to the seal???

Regards
Geoff 17

Hi Geoff,

Yeah the "O" rings I mentioned are on the transfer idler shaft,
if you are getting gear noise in 4th it could be due to the same idler shaft and roller bearings wearing,
The plastic seat under the gearshift pivot is prone to breaking up after a fair while and I think only came in 2 sizes back then to suit whichever transmission.
If it's badly deteriorated will give a noise like badly worn gears due to metal to metal contact rattling.
Extended breathers are always good anyway.

Cheers

Hi Geoff.
If you want to send me an email; bushyx2 at bigpond dot com I could have some useful information for you.
Mike