mcc1979ian Posted March 27, 2015 Share Posted March 27, 2015 ok so part way through my rebuild I sold my 1.4 lt230 transfer box in favour of a Discovery lt230 but I noticed its 1.22. I'm running a 4.6 v8. Question is have I gone in the wrong direction with the ratios? Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted March 27, 2015 Share Posted March 27, 2015 Tyre size/diff ratios? Quote Link to comment Share on other sites More sharing options...
mcc1979ian Posted March 27, 2015 Author Share Posted March 27, 2015 35 12.5 R15. Not sure about diffs. How do I find out their Ratio? Quote Link to comment Share on other sites More sharing options...
Nigelw Posted March 27, 2015 Share Posted March 27, 2015 What size tyres you gonna be running? 33 and over then, yes you might well have done, although the 4.6 will have more poke to gain speed quicker than my 200 Tdi the Disco Tbox will give better economy and less noise cruising on the highway but if you're manual it might be the same ball ache as I've found running 33" with a 1.2 Tbox. Hope that hasnt muddied the water too much Quote Link to comment Share on other sites More sharing options...
robertspark Posted March 28, 2015 Share Posted March 28, 2015 Are they standard diffs? 3.54:1 or do you have different crown wheel and pinions fitted? Quote Link to comment Share on other sites More sharing options...
mcc1979ian Posted March 28, 2015 Author Share Posted March 28, 2015 As far as i know their standard. I havent fiddled with them yet. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted March 28, 2015 Share Posted March 28, 2015 Then yes, you more likely want a 1.6 box. Either that or 4.7 ratio diffs, this will give you back your low range as well. Quote Link to comment Share on other sites More sharing options...
need4speed Posted March 28, 2015 Share Posted March 28, 2015 Yep what Bowie says. I will be running 35's, and because i already have a freshly rebuilt transfer box i didnt want to mess with that. Therefore i will need to go 4.7 cw&p's. In short yeah, you went the wrong way. Big top speed though...........eventually Quote Link to comment Share on other sites More sharing options...
Bingy Posted March 28, 2015 Share Posted March 28, 2015 +1 on the above posts from Bowie and N4S regarding diff ratios. HFH did a gear ratio calculator table somewhere Having spoken to Nige, Im running a 4.6 with 1,4 transferbox on 35's and Nige recommended using 4.75 c&ps Quote Link to comment Share on other sites More sharing options...
=jon= Posted March 28, 2015 Share Posted March 28, 2015 http://www.ashcroft-transmissions.co.uk/calc/ratio_calc.html Quote Link to comment Share on other sites More sharing options...
landroversforever Posted March 28, 2015 Share Posted March 28, 2015 My 90 will be on 35s, with them a 1.2 and 4.75 CW I will be at pretty much standard gearing. it works out a smidge lower in low range, and a smidge higher in high range. Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted March 29, 2015 Share Posted March 29, 2015 That's no bad thing Ross ? Quote Link to comment Share on other sites More sharing options...
landroversforever Posted March 29, 2015 Share Posted March 29, 2015 I know mo, exactly what I was after Quote Link to comment Share on other sites More sharing options...
wanger Posted March 29, 2015 Share Posted March 29, 2015 yes i like the idea of an "over" and an "under" drive on both high and low box. are they ashcroft / a n other brand? HD ?? Quote Link to comment Share on other sites More sharing options...
landroversforever Posted March 29, 2015 Share Posted March 29, 2015 The 4.75 CW&P are ashcroft ones. As is the rebuilt 1.2 transferbox. Quote Link to comment Share on other sites More sharing options...
need4speed Posted March 29, 2015 Share Posted March 29, 2015 It appears that they have only recently started doing 4.75 for td5 rear axle. Last time i looked only a few weeks ago they only did 4.75 for salisbury rear Quote Link to comment Share on other sites More sharing options...
mcc1979ian Posted March 29, 2015 Author Share Posted March 29, 2015 What do you mean by CW&P? Quote Link to comment Share on other sites More sharing options...
need4speed Posted March 29, 2015 Share Posted March 29, 2015 Crownwheel & Pinion. Quote Link to comment Share on other sites More sharing options...
landroversforever Posted March 29, 2015 Share Posted March 29, 2015 What Phil said! CrownWheel and Pinion. Quote Link to comment Share on other sites More sharing options...
mcc1979ian Posted March 31, 2015 Author Share Posted March 31, 2015 Where might be tge best place to pick up a couple Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted March 31, 2015 Share Posted March 31, 2015 Ashcroft, KAM or Megasquirt-v8, that uses Ashcroft stuff I believe, and will build them up for you. Quote Link to comment Share on other sites More sharing options...
mcc1979ian Posted April 1, 2015 Author Share Posted April 1, 2015 Cheers Quote Link to comment Share on other sites More sharing options...
landroversforever Posted April 1, 2015 Share Posted April 1, 2015 Admittedly Nigel is a loooooooong way from you, but I've had nothing but great service from him Quality work every time. 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.