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Cross-Drilling Necessary on LT-230?

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17 replies to this topic

#1
PaulD

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I will be swapping my BWTC for a 1995 Disco locking LT-230 TC sometime in August in my RRC.

 

Since I only drive my RRC <2,000 miles a year, is it really necessary to cross-drill the output shaft on my TC main gear...?

 

Go ahead an weigh-in, Dan.

 

Tx,

 

Paul


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#2
Disco2Guy

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Or Graeme, they're both really good at this game:)

 

Is this for better oil flow in the tc? It sounds familiar. Probably mentioned by one of the two, or both, guys above.


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#3
El Solis

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Not necessary but I would. There are other options too. I had my access cover tapped and run a line from the bottom of the TC oil pan through a fuel pump which squirts it down the center of the input shaft. I just flip a switch on the dash every now and then. Apparently (and those who actually know can and should correct me) the TC's input shafts were stripping threads by 30k-35k miles. If you don't get a TC with a crossed drilled input shaft you can buy on or have it drilled.


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Edited by ChristopherSolis, 09 July 2015 - 07:56 PM.

Chris KK6CQE

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#4
DHappel

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Not necessary but I would. There are other options too. I had my access cover tapped and run a line from the bottom of the TC oil pan through a fuel pump which squirts it down the center of the input shaft. I just flip a switch on the dash every now and then. Apparently (and those who actually know can and should correct me) the TC's input shafts were stripping threads by 30k-35k miles. If you don't get a TC with a crossed drilled input shaft you can buy on or have it drilled.
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#5
El Solis

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Sent from my iPad using Tapatalk

Chris KK6CQE

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08 BMW 550i
2013 Discovery 4, Black Pack, NCLR sticker as only modification….for now
1963 Jaguar MK2 3.8 litre


#6
DHappel

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Wait-why can I see his full post in my reply but it cuts off mid sentence in the original post?

Don
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#7
Disco2Guy

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The OP and reply both look ok to me.


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#8
GraemeWare

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I will be swapping my BWTC for a 1995 Disco locking LT-230 TC sometime in August in my RRC.

 

Since I only drive my RRC <2,000 miles a year, is it really necessary to cross-drill the output shaft on my TC main gear...?

 

Paul,

 

This is the very short version.  No.

 

If you are wheeling or pulling, or generally abusing the truck a lot, then the easiest way is to buy a later type input gear for around $80 (I think that is what I can do one for, but will need to check).  It should be FTC5089/5087/4850 (I'd need to know the box serial number).  You will also need to check that you have the longer splined output shaft from the gearbox (if auto, all manuals I think have the longer splined shaft) otherwise you'll wonder why the two won't quite close up (ask me how I know ....).

 

You can drill them, if you have a very hard drill bit, take it real slow, with plenty of lube ..... (wait for the smutty comments), but you'll still not get the longer splnes which are stronger.

 

Now wait for the "Q" verses "T" strength discussion .....

 

Graeme


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Graeme Ware -- San Carlos, CA

1990 Range Rover Classic - LT230 Transfer box, Warn winch, 2" lift, 235/85-16 Dunlop MUD Rovers, "Blue Submarine"
1996 Discovery 1 (R380 Manual Transmission, Ashcroft under-drive, RoverWare rear bumper, 33x12.5-15 BFG ATs) -- we call her "Katrina" -- Fordyce 7.5 mile survivor
1999 Discovery 2 (D1 CDL Linkage, 265/75-16 BFG A/T KO, RoverWare front and rear bumper)
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#9
Disco2Guy

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"T" gears in a "Q" case.


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#10
TigerDan

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I believe accelerated spline wear on non-cross-drilled transmssion output shafts was more of a problem on manual transmissions than on autos due to the higher shock loading. (And if it hasn't been made clear by now, it's the transfer case input shaft that gets cross-drilled, not the output shaft.) However, it can't hurt to get a little more oil in there...


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#11
GraemeWare

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I believe accelerated spline wear on non-cross-drilled transmssion output shafts was more of a problem on manual transmissions than on autos due to the higher shock loading. (And if it hasn't been made clear by now, it's the transfer case input shaft that gets cross-drilled, not the output shaft.) However, it can't hurt to get a little more oil in there...

 

And the gear not the shaft ....

 

It seems the real problem was bad hardening of the gear, since people find that when they cross-drill, some are really hard and some as soft as butter ....

 

Regards,

 

Graeme


Graeme Ware -- San Carlos, CA

1990 Range Rover Classic - LT230 Transfer box, Warn winch, 2" lift, 235/85-16 Dunlop MUD Rovers, "Blue Submarine"
1996 Discovery 1 (R380 Manual Transmission, Ashcroft under-drive, RoverWare rear bumper, 33x12.5-15 BFG ATs) -- we call her "Katrina" -- Fordyce 7.5 mile survivor
1999 Discovery 2 (D1 CDL Linkage, 265/75-16 BFG A/T KO, RoverWare front and rear bumper)
1993 Jaguar XJS convertible; 1971 Triumph GT6; 1959 Morris Minor convertible
other assorted British pot metal ...


#12
DHappel

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Don't they make pills for that now?













Sorry, I knew you were waiting for the juvenile comments. Didn't want to disappoint.
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Don
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#13
RedRover

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#14
TigerDan

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So we've covered the topics of lube and shafts in this thread... (not to mention lubed shafts!) How much more can we digress?


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#15
GraemeWare

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So we've covered the topics of lube and shafts in this thread... (not to mention lubed shafts!) How much more can we digress?

 

Dan,

 

I was going to post a picture of "the gear", but the forum seems to block that particular fetish site .... and I'd probably get banned for life ...

 

Graeme


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Graeme Ware -- San Carlos, CA

1990 Range Rover Classic - LT230 Transfer box, Warn winch, 2" lift, 235/85-16 Dunlop MUD Rovers, "Blue Submarine"
1996 Discovery 1 (R380 Manual Transmission, Ashcroft under-drive, RoverWare rear bumper, 33x12.5-15 BFG ATs) -- we call her "Katrina" -- Fordyce 7.5 mile survivor
1999 Discovery 2 (D1 CDL Linkage, 265/75-16 BFG A/T KO, RoverWare front and rear bumper)
1993 Jaguar XJS convertible; 1971 Triumph GT6; 1959 Morris Minor convertible
other assorted British pot metal ...


#16
TigerDan

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I've got a pic I found on the 'Net a few years back of a guy doing unspeakable things to the tailpipe of a Range Rover. I should post it...but I'm sure that one would be good for a ban...or at least an infraction!


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#17
Disco2Guy

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I've seen that pic Dan ;)


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#18
GraemeWare

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I've seen that pic Dan ;)

 

......


Graeme Ware -- San Carlos, CA

1990 Range Rover Classic - LT230 Transfer box, Warn winch, 2" lift, 235/85-16 Dunlop MUD Rovers, "Blue Submarine"
1996 Discovery 1 (R380 Manual Transmission, Ashcroft under-drive, RoverWare rear bumper, 33x12.5-15 BFG ATs) -- we call her "Katrina" -- Fordyce 7.5 mile survivor
1999 Discovery 2 (D1 CDL Linkage, 265/75-16 BFG A/T KO, RoverWare front and rear bumper)
1993 Jaguar XJS convertible; 1971 Triumph GT6; 1959 Morris Minor convertible
other assorted British pot metal ...





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