40 TO 50MPH CRUISING SPEED???

Post by **loubie** » 29 Dec 2006, 16:53

Hi, I recently bought a diesel T25 that orignally was a 1600 non turbo, but was told it had a 1900 from a Passat put in it, which runs great, no problems at all. BUT... it only does 60mph with its 5 speed gearbox and sounds like its at full revs. Can other gearboxes be fitted or is this normal for them. How fast are these things meant to cruise at? I have to cruise around bet 40 to 50mph or put earplugs in and watch the fuel consumption go through the roof.

I always start off in 2nd gear and I will sometimes pull off in 3rd, it all seems a bit odd. Any advice would be appreciated.

Many thanks, Louise

Post by **andysimpson** » 29 Dec 2006, 17:20

Do you know what your gearbox code is?
Has it got standard wheel tyres? if not what size tyres.

Post by **wasserleaker** » 29 Dec 2006, 17:44

The gearshift pattern is very strange to get used to on the 5-speeds!
especially if you occasionally drive other cars as well with a 'normal' gearchange.
other T25 5-speeds will fit, and there are a few different final drive ratios, depending on what vehicle it was fitted to, [under the gearbox is a code no. 2 or 3 letters/numbers,, from which you can find out what the final drive ratio is, and what engine it was orig. bolted to]
depending what you've got fitted at the mo, you may be able to get one with a 'taller' final drive ratio, in simpler terms, it'll go faster for the same amount of engine rev's in all gears, and have a faster top speed.
eg, an 'AAP' code no. 'box has a 4.57 final drive, where-as a '3H' code no. 'box has a 4.83 final drive ratio, the lower the number, the higher the gearing, so the 'AAP' will make your bus go faster at any given rev's than the '3H' box. theres a website which explains the code numbers. hope all this makes sense, i'm sure someone will point out anything i'm wrong on. in other words, yes, other 5-speed box's will fit

[and 4-speeds, but its a bit trickier i think, to sort the linkage out]

Post by **camper** » 29 Dec 2006, 17:53

Put a 1.9 dg petrol engine gearbox in it.Change over to diesel input shaft and bell housing .Proberly need the dg gear change rods and box rear mount as yours is a 5 speed .I run a 1.6td diesel with a 2ltr aircool dk gear box runs like a dream with it .There are no problems pulling up hills with it and the revs drop for cruising at 55/60 mph.I fitted a dg petrol gearbox to 1.6n diesel to an other van and that run well with it.Theres one on flebay Item number: 290066589900 .

Post by **philippacman** » 29 Dec 2006, 19:34

it prob the gear box ratio,s
so you will need to fit a DK coded 2l petrol air cooled box

Post by **"WEAZLECHIN"** » 29 Dec 2006, 20:16

fit some 225/75/15 wheels and tyres on it, its easier than messing around with box ratios, plus your van looks better..

Post by **shepster** » 04 Jan 2007, 09:22

There's a guy on here called 'oldiguana' who fitted a 1.9 diesel that had a similar problem and had to change the gearbox for a petrol one if i remember correctly, he's very helpful and only lives in Stoke so i'm sure he'll give you some advice.