sammyb Posted February 19, 2012 Share Posted February 19, 2012 Right, sorry for all the threads lately but I'm relatively new to the LR scene and know not so much on them... Here we go, how do identify the gearbox on my 90 (2.5 TD)?? as it is dripping oil from every where.. Also are the defender and discovery gearboxes for 200 tdi's the same as there is one in a local breakers and if I use a disco gearbox is everything a straight swap over?? Also Ive read that there are 2 different transfer box final drive ratio's, how do I determine which one is which? as id want the one the one that is lowest (slightly better top speed) which is the 1.2 one?? Another small one is my back axle has a weep that looks like is coming straight out the casing, not the usual places like the bungs/breathers or diff plate...anyone else had this sort of issue where the diff housing has rotted away? Quote Link to comment Share on other sites More sharing options...
landroversforever Posted February 19, 2012 Share Posted February 19, 2012 (edited) On a 2.5 TD it will be the LT77 gearbox Disco gearboxes will not fit without putting the gear levers in a strange place. They put the sticks into the seatbox due to a different mounting and tailcasting on the gearbox. Transferboxes... there are 3 4 ratios AFAIK: 1.6 which yours probably has with the age, 1.4 (the normal defender one) and the 1.2 which is the discovery ratio. There is also a 1:1 ratio! Your 2.5TD is going to struggle to pull the 1.2 especially if you have reasonable sized tyres. If you're only on 205s then it might do it. I haven't myself, but have seen some very rusty axle casings. Has the vehicle been used for launching boats? as that would cause more corrosion on the rear axle than normal. Edited February 19, 2012 by landroversforever Quote Link to comment Share on other sites More sharing options...
landroversforever Posted February 19, 2012 Share Posted February 19, 2012 You should be able to find your current ratio from this list: this may be useful, from our website : List of Serial numbers and corresponding Ratios All stock LT 230"s have a low ratio of 3.321, the following list refers to the high range ratio. 12D = 1.667 LT 230R 13D = 1.410 LT 230R 14D = 1.003 LT 230R 15D = 1.192 LT 230R 20D = 1.667 (2.5 N/A 110), 22D = 1.410 (all 4Cyl 90/110 bar above), 25D = 1.410 (V8 110 LT 85), 26D = 1.003 (RR Classic 3 speed auto), 27D = 1.192 (early RR Classic), 28D = 1.222 (RR and Disco I), 29D = 1.192 (V8 90 LT 85), 32D = 1.222 34D = 1.410 (2.0 Disco I), 36D = 1.211 38D = 1.211 40D = 1.211 (NAS/Japan 90&Disco), 41D = 1.211 (Disco II, diff lock stud), 42D = 1.211 (Disco II, diff lock stud), 43D = 1.410 (90/110 TD5), 57D = 1.410 (90/110 TD5), 61D = 1.211, 62D = 1.211, 68D = 1.211, 69D = 1.211, 70D = 1.211 (Disco II, no diff lock), Taken from here if you want even more info: http://forums.lr4x4.com/index.php?showtopic=5435 Quote Link to comment Share on other sites More sharing options...
Boris113 Posted February 19, 2012 Share Posted February 19, 2012 A disco box in a defender will bring your gearstick up as in the pic below. My mate put one in his 90 (it was cheap) and quite likes the positioning of it but you are unable to fit a middle seat and will probably have to make your own cubby box. You also have to fabricate some kind of cover for the levers. I would stick with a defender box personally. With your axle, stick a picture up, someone will be able to tell you if it looks repairable. Harry Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted February 19, 2012 Share Posted February 19, 2012 Most transfer boxes have a sticker attached to them with the ratio on it, like this, and the serial is in the same place too: Quote Link to comment Share on other sites More sharing options...
sammyb Posted February 19, 2012 Author Share Posted February 19, 2012 thanks chaps ill go investogate with a wire brush Quote Link to comment Share on other sites More sharing options...
PieEater3142 Posted February 20, 2012 Share Posted February 20, 2012 they don't always have a ratio sticker on. Burnt mine off heating the box when trying trying to crack the filler cos previous owner had painted the box.... Quote Link to comment Share on other sites More sharing options...
landroversforever Posted February 20, 2012 Share Posted February 20, 2012 no sticker on mine! too much oily mud! Quote Link to comment Share on other sites More sharing options...
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