r380 gearbox

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hybridv8
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r380 gearbox

Post by hybridv8 » Sat Jul 05, 2008 11:31 am

hi all,
could somebody please answer a couple of questions i have,im thinking of fitting a r380 box to a 3.5 v8,
are discovery 3.5,3.9 and diesel boxes the same,or are the bell housings differant,and what year did the r380 come out,
many thanks..

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Re: r380 gearbox

Post by al_wilson100 » Tue Jul 08, 2008 10:05 am

As far as i'm aware the actual boxes themselves are the same just that the bell housings are different.

Disco/Rangie ones are short stick, 90/Defender are Long stick....but you can mess about with that!

The R380 replaced the LT77S 5 speed in March 1994 for the range rover (not sure of dates for disco) but I know for definate that 300 series (around M-Reg) disco's are R380. (the reverse gear is behind 5th on a R380)

If you are replacing an LT77 box for the R380 the you could probabbly use the same bellhousing?

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Ian
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Re: r380 gearbox

Post by Ian » Sun Jul 13, 2008 11:18 pm

I think that the main input shaft is a different size on the v8 R380 to a diesel R380. It may just need a different spigot, but not sure.

dave skone

Re: r380 gearbox

Post by dave skone » Tue Jul 15, 2008 7:40 pm

Input shaft is different on v8 to diesel diameter of spigot & lenth.

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Re: r380 gearbox

Post by Mike Arthur » Sun Nov 16, 2008 11:18 am

A further question on R380. Does anyone know if the BH to geabox pattern is the same between an R380 and LT77? Question is whether I can temporarily substitute an LT77 in place of an R380......thanks
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dave skone

Re: r380 gearbox

Post by dave skone » Sun Nov 16, 2008 6:27 pm

yes the bolt pattern is the same mike.
what are u tring to do?
because the input shafts on the v8 and diesel boxes are different lengths.

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Re: r380 gearbox

Post by Mike Arthur » Mon Nov 17, 2008 11:01 am

thanks Dave.
it s long story. I find myself needing a long stick diesel r380, but I don't have one. I might have a diesel lt77, I was wondering if I could use it until the right one turns up. Now I ask myself are the mainshafts the same between the above boxes...
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dave skone

Re: r380 gearbox

Post by dave skone » Mon Nov 17, 2008 2:17 pm

not sure about that? but i did have problems with my r/rover lt77 when i put 300 tdi in
got hold of 200 tdi bellhousing & found that there was not much difference in the length of input shafts so went ahead & fitted it (about 3/8" if i remember) but because mainshaft wasn`t supported well enough it eventualy ripped the clutch to bits, resulting in no drive @ all, total cost of the week end that it went on was in the region of £950
so do it right the first time what ever it is?.
ps i know some one who has r380 but for a v8 no good to u i supose?

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Re: r380 gearbox

Post by Mike Arthur » Mon Nov 17, 2008 2:50 pm

Thanks Dave, but I have 2 smooth case (v8) LT85's now just sitting idle at the moment. maybe time for e-bay.....

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Re: r380 gearbox

Post by Nedkelly » Mon Nov 17, 2008 9:36 pm

Some points on R380 gearboxes.
2 Types of bellhousings, FRC3921 fits TDI's and MPI's and FRC3922 fits V8's
3 Types of input shaft MPI, TDI and V8, all different.
3 Types of selector shaft, Defender , Discovery are probably the ones we would want but there is also a P38 variant.
The input shafts all have the same gear on the end so its possible to mix and match as long as you have the matching bellhousing. For example I turned a TDI R380 into an MPI one by just changing the input shaft.
I could have turned it into a V8 one by using a V8 shaft and bellhousing.
Be aware there a few different ratios for 1st, 2nd and 3rd depending on if its a TDI, MPI or V8 ( as far as I am aware 4th and 5th are all the same) they change the layshaft and the 1st 2nd and 3rd mainshaft gears to do this. Easy enough to work out from EPC or Microcat.
You need to swop the selector shaft if you want to change between the defender to disco gearstick.
Unfortunately you need to be able to take the gearbox to bits to do any of the above !!
I am not sure whats interchangable between LT77 and R380 as I have never tried other than as a straight swop in TDI disco's.

dave skone

Re: r380 gearbox

Post by dave skone » Tue Nov 18, 2008 7:21 pm

See if you wait long enough mike you always get a smart ass?
no i`m only joking mark
seem`s like you have given all the info you cuold need there well done mark
ps mark will pm you in a bit with the details you asked for?

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Re: r380 gearbox

Post by Mike Arthur » Wed Nov 19, 2008 3:27 pm

:lol: Yes, thanks Mark, Dave. Excellent info. The amount of LR knowledge that is on tap on this forum is really handy.
Cheers!
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Nedkelly
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Re: r380 gearbox

Post by Nedkelly » Fri Nov 21, 2008 8:51 pm

I had to be a smart ass unfortunatly Dave as I didn't have the loose change to go sequential ,never mind.!!!
As always only joking.
Also if Im going to be the forum anorak I will have to look up all the P38 and TD5 part nos and ratios that I missed !
Do your home work on ratios too otherwise you will end up spending a few quid at Rakeway on crownwheels and pinions like me !

dave skone

Re: r380 gearbox

Post by dave skone » Sat Nov 22, 2008 9:24 am

Hi mark, Its good to know there are pepole like yourself out there that have the access to all these different part no`s
keep up the good work.
have u booked for the dinner yet?
if not why not?

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Re: r380 gearbox

Post by Mike Arthur » Mon Dec 01, 2008 8:01 pm

Hi Guys, I'm back with another question! (or two)
If anyone is near an R380 (and I think it won't matter if it's a v8 or tdi), could you please measure the distance from the bellhousing face (where gb meets the bh) to the transfer box face? thanks. Also, do you know if the gearbox mounts to chassis were ever different between various model defenders? (such that the actual geabox was physically located further back in the chassis?)
Again, thanks for any help!!! Dave, I'll explain all at the agm/dd...especially if I haven't sorted this conundrum by then!!
cheers
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