Originally Posted by blupaddler
Is the old Quadvan TTB the same as Agile's TTB?
Or does one have better travel?
Here are my observations (subject to someone more knowledgeable making corrections if I am wrong)
We had a QV TTB for 13 yrs and have had the Agile TTB for 4 years.
While they are very similar obviously since they are both TTB Dana 50's and they both add the coil spring perches, there are some differences between the two.
Agile likely has a bit more travel due to its custom designed/ fabricated radius arm design. But with an added sway bar wheel travel will be limited by the links.
QV TTB has a the Big (1997 style) Bronco parallel radius arm setup they then adapted for the van conversions.
Agile does not widen the track to match the stock 2WD front track and thus the Agile TTB track actually matches the OEM rear wheel track. Good and bad here as the track is the same so no spacer's for the rear but the FRONT track is 3" narrower than stock.
QuadVan TTB changes the TTB axles pivot point and adds an axle spacer to have the track match the stock 2wd van front track. This was likely a necessity for QVan since their system is Ford Approved. Thus QVan uses much of the stock van's steering components while Agile has to make modifications due to the narrower track. Qvan offered 1.5" spacers for the rear wheels to have the rear track match the front track.
The handling is pretty much the same between the two. Our QV TTB was a V10 EB with dual front shocks and serious sway bars. It handled mountain roads unbelievably for a 6,000 lb+ vehicle. BUT the wheel travel limited by the sway bars was bad for offroad.
The Agile is a 7.3 EB - the extra weight of the 7.3 definitely changes the handling. We also have a sway bar up front and I have not missed the rear sway bar. Ramsey (Agile) was against installing the front sway bar and said it would handle fine without it. I asked that it be put on and he did so. I have not driven it without the sway bar so I have no feedback if he was correct.
Both use the vans OEM brakes in their standard conversions. Agile (and I guess QuadVan) have a big brake option.
QuadVan stopped TTB conversions in early mid 2004 when Ford ran out of new stock for the parts he was using. Since he conversion was a Ford Approved Upfit he had to follow the agreed to conversion process. He had no desire (I a guessing Ford frowned upon) to refurb F250HD TTB parts to continue to offer his TTB. Plus QVan had designed a Ford Approved solid front axle conversion at that point knowing the demise of new parts was on the horizon.
Hope that helps!